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Peter wrote two general epistles. The Gospel of Mark is also ascribed to him (as Mark was his disciple and interpreter). Several other books bearing his name — the Acts of Peter, Gospel of Peter, Preaching of Peter, Apocalypse of Peter and Judgment of Peter — are rejected by the Catholic Church as apocryphal. According to New Testament accounts, Peter was one of twelve apostles chosen by Jesus from his first disciples. Originally a fisherman, he was assigned a leadership role by Jesus and was with Jesus during events witnessed by only a few apostles, such as the Transfiguration. Cephas (Aramaic) and Peter (Greek) both mean "rock". According to the New Testament, Peter confessed Jesus as the Messiah, was part of Jesus' inner circle, walked on water, witnessed Jesus' transfiguration, denied Jesus, was restored by Jesus, and preached on the day of Pentecost.

Peter is said to have been crucified under Emperor Nero Augustus Caesar. It is traditionally held that he was crucified upside down at his own request, since he saw himself unworthy to be crucified in the same way as Jesus Christ. Catholic tradition holds that Saint Peter's site of crucifixion is located in the Clementine Chapel, while his mortal bones and remains are contained in the underground Confessio of St. Peter's Basilica which is the site Pope Paul VI announced the excavation discovery of a first century A.D. Roman cemetery in 1968. Since 1969, a life size statue of Saint Peter is crowned every year in St. Peter's Basilica with a papal tiara, ring of the fisherman and papal vestments every June 29, commemorating the holy feast of Saints Peter and Paul.

His original name was Shimon or Simeon, Simon in modern English. He was later given the name Peter, a name derived from "Petrus" which is a masculinized form of the feminine Latin word petra (f) which means rock (cf. petroleum). For what concerns Greek, the same idea holds: "Πέτρος (Petros)" is derived from πέτρα (petra). The Latin word "petra" is a loanword from Greek.

The English and German "Peter", the French "Pierre", the Italian "Pietro", the Spanish and Portuguese "Pedro", the Polish and Russian "Piotr" are derived from "Petrus". The pun with "rock" also works in Italian (pietra (f)), French (pierre (f)) and Portuguese (pedra (f)).

On the other hand, the Syriac or Aramaic word for "rock" is "cephas", which became Greek: Πέτρος, also meaning "rock". He is also known as Simon Peter, Cephas (Greek: Κηφᾶς) and Kepha (Hebrew: כיפא‎). Both Cephas and Kepha also mean rock.

The Catholic theologian Rudolf Pesch argues that the Aramaic word "cepha" means "stone, ball, clump, clew", the meaning "rock" is only a connotation. The Greek word "petra" denotes "grown rock, rocky range, cliff, grotto"; "petros", however, means "stone" such as "small stone, firestone, sling stone, moving boulder".

Using English gematria, Peter=64=P16+E5+T20+E5+R18 and contains a 't' - a cross - this is symbolic of him being crucified in 64 AD.

Peter's life story is told in the four Canonical Gospels, The Book of Acts, New Testament Letters, Non-Canonical Gospel. According to the Hebrews and other Early Church accounts of his life and death. In the New Testament, he is among the first of the disciples called during Jesus' ministry. It was during his first meeting with Jesus that Jesus named him Peter. Peter was to become the first Apostle ordained by Jesus in the early church.

Peter ran a fishing business in Bethsaida. He was named Simon, son of Jonah or John. The Synoptic Gospels all recount how Peter's mother - in - law was healed by Jesus at their home in Capernaum, which, coupled with 1 Cor. 9:5, clearly depict Peter as married man. His wife is known in the East as Febronia and her feast is celebrated on June 28. In the Synoptic Gospels, Peter (then Simon) was a fisherman along with his brother Andrew and the sons of Zebedee, James and John. The Gospel of John also depicts Peter fishing, even after the resurrection of Jesus, in the story of the Catch of 153 fish. In Matthew and Mark, Jesus called Simon and his brother Andrew to be "fishers of men".

In Luke, Simon Peter owns the boat that Jesus uses to preach to the multitudes who were pressing on him at the shore of Lake Gennesaret. Jesus then amazes Simon and his companions James and John (Andrew is not mentioned) by telling them to lower their nets, whereupon they catch a huge number of fish. Immediately after this, they follow him. The Gospel of John gives a comparable account of "The First Disciples". In John, we are told that it was two disciples of John the Baptist (Andrew and an unnamed disciple) who heard John the Baptist announce Jesus as the "Lamb of God" and then followed Jesus. Andrew then went and fetched his brother Simon, saying, "We have found the Messiah", and then brought Simon to Jesus.

Three of the four canonical Gospels – Matthew, Mark and John – recount the story of Jesus walking on water. Matthew additionally describes Peter walking on water for a moment, but beginning to sink when his faith wavered.

At the beginning of the Last Supper, Jesus washed his disciples' feet. Peter initially refused to let Jesus wash his feet, but when Jesus responded: "If I wash thee not, thou hast no part with me", Peter replied: "Lord, not my feet only, but also my hands and my head". The washing of feet is often repeated in the service of worship on Maundy Thursday by some Christian denominations.
The three Synoptic Gospels all mention that, when Jesus was arrested, one of his companions cut off the ear of a servant of the High Priest. The Gospel of John also includes this event and names Peter as the swordsman and Malchus as the victim. Luke adds that Jesus touched the ear and miraculously healed it. This healing of the servant's ear is the last of the 37 miracles attributed to Jesus in the Bible.

In a dialogue between Jesus and his disciples (Matthew 16:13-20), Jesus asks, “Who do people say that the Son of Man is?” The disciples give various answers. When he asks, "Who do you say that I am?" Simon Peter answers, "You are the Christ, the Son of the living God." In turn, Jesus declares Peter to be "blessed" for having recognized Jesus' true identity and attributes this recognition to a divine revelation. Then Jesus addresses Simon by what seems to have been the nickname "Peter" (Cephas in Aramaic, Petros [stone] in Greek) and says, "On this rock (petra in Greek) I will build my church, and the gates of Hell will not prevail against it."

A common exegetical interpretation of Peter is provided by Daniel Harrington who suggests that Peter was an unlikely symbol of stability. While he was one of the first disciples called and served as the spokesman for the group, Peter is also the exemplar of "little faith" in Matthew 14, will soon have Jesus say to him, "O you of little faith, why did you doubt?" and will eventually deny Jesus three times. In light of the Easter event, then, Peter became an exemplar of the forgiven sinner. A great variance of opinions exists as to the interpretation of this passage with respect to what authority and responsibility, if any, Jesus was giving to Peter.

Petros had not previously been used as a name, but in the Greek-speaking world it became a popular Christian name, after the tradition of Peter's prominence in the early Christian church had been established.

In the Eastern Orthodox Church this passage is interpreted as not implying a special prominence to the person of Peter, but to Peter's position as representative of the Apostles. The word used for "rock" (petra) grammatically refers to "a small detachment of the massive ledge", not to a massive boulder. Thus, Orthodox Sacred Tradition understands Jesus' words as referring to the apostolic faith.

The great majority of Western scholars concur with the interpretation that the "rock" was Peter, not Jesus himself or Peter's faith.

All four canonical gospels recount that, during the Last Supper, Jesus foretold that Peter would deny him three times before the following cockcrow ("before the cock crows twice" in Mark's account).

Matthew adds that it was his accent that gave him away as coming from Galilee. Luke deviates slightly from this by stating that, rather than a crowd accusing Simon Peter, it was a third individual.

The Gospel of John places the second denial while Peter was still warming himself at the fire, and gives as the occasion of the third denial a claim by someone to have seen him in the garden of Gethsemane when Jesus was arrested.

In the Gospel of Luke, Jesus' prediction of Peter's denial is coupled with a prediction that all the apostles ("you", plural) would be "sifted like wheat", but that it would be Peter's task ("you", singular), when he had turned again, to strengthen his brethren.

In a reminiscent scene in John's epilogue, Peter affirms three times that he loves Jesus.

In John's gospel, Peter is the first person to enter the empty tomb, although the women and the beloved disciple see it before him. In Luke's account, the women's report of the empty tomb is dismissed by the apostles, and Peter is the only one who goes to check for himself. In fact, he runs to the tomb. After seeing the grave clothes he goes home, apparently without informing the other disciples.

Paul's First Epistle to the Corinthians contains a list of resurrection appearances of Jesus, the first of which is an appearance to Peter. Here Paul apparently follows an early tradition that Peter was the first to see the risen Christ, which however did not seem to have survived to the time when the Gospels were written.

In the final chapter of the Gospel of John, Peter, in one of the resurrection appearances of Jesus, three times affirmed his love for Jesus, balancing his threefold denial, and Jesus reconfirmed Peter's position.

Peter is listed first among the Twelve Apostles in the canonical gospels and in the Book of Acts (Acts 1:13). He is also frequently mentioned in the Gospels as forming with James the Elder and John a special group within the Twelve Apostles, present at incidents at which the others were not present, such as at the Transfiguration of Jesus. He often confesses his faith in Jesus as the Messiah.

Peter is often depicted in the Gospels as spokesman of all the Apostles. Catholics refer to him as chief of the Apostles, as do the Eastern Orthodox and the Oriental Orthodox. In Coptic Orthodox Church Liturgy, he is once referred to as “Prominent” or "head" among the Apostles, a title shared with St. Paul in the text (The Fraction of Fast and Feast of the Apostles Peter and Paul in the Coptic Orthodox Church of Alexandria). Some, including the Orthodox Churches, believe this is not the same as saying that the other Apostles were under Peter's orders. In contrast, Jewish Christians are said to have argued that James the Just was the leader of the group. Some argue James was the Patriarch of Jerusalem and that this position at times gave him privilege in some (but not all) situations. The early Church historian Eusebius (c. AD 325) records Clement of Alexandria (c. AD 190) as saying,

Paul affirms that Peter had the special charge of being apostle to the Jews, just as he, Paul, was apostle to the Gentiles.

The author of the Acts of the Apostles portrays Peter as an extremely important figure within the early Christian community, with Peter delivering a significant open air sermon during Pentecost. According to the same book, Peter took the lead in selecting a replacement for Judas Iscariot. He was twice arraigned, with John, before the Sanhedrin and directly defied them. He undertook a missionary journey to Lydda, Joppa and Caesarea, becoming instrumental in the decision to evangelize the Gentiles.

About halfway through, the Acts of the Apostles turns its attention away from Peter and to the activities of Paul, and the Bible is mostly silent on what occurred to Peter afterwards.

Acts 12 tells how Peter was put into prison by King Herod, but was rescued by an angel.

At the Council of Jerusalem (c. 50), the early Church, Paul and the leaders of the Jerusalem church met and decided to embrace Gentile converts. Acts portrays Peter as successfully opposing the Christian Pharisees who insisted on circumcision.

Peter/Cephas is mentioned briefly in Paul's Epistle to the Galatians, which mentions a trip by Paul to Jerusalem where he meets Peter (Galatians 1:18), and a trip by Cephas to Antioch where Paul rebuked him for treating Gentile converts as inferior to Jewish Christian (see the Incident at Antioch). Galatians is accepted as authentic by almost all scholars, so these are the earliest mentions of Peter to be written.

Church tradition ascribes the epistles First and Second Peter to Apostle Peter, as does the text of Second Peter itself. First Peter implies the author is in "Babylon," which has been held to be a coded reference to Rome (1 Peter 5:13). Although, Babylon was an important fortress city in Egypt, just north of today's Cairo and this fact is combined with the "greetings from Marc" (1 Peter 5:13), who is regarded as founder of the Church of Alexandria (Egypt); thus other scholars put the First Peter epistle to be written in Egypt. Some scholars regard First Peter as not authored by him, and there is still considerable debate about the Petrine authorship of Second Peter. However the Greek in both books is similar, and the early Church was adamantly opposed to pseudographical authorship.

In Catholic tradition, Peter is said to have founded the church in Rome with Paul, served as its bishop, authored two epistles, and then met martyrdom there along with Paul.

Later accounts expand on the brief Biblical mention of his visit to Antioch. The Liber Pontificalis (9th century) mentions Peter as having served as bishop of Antioch for seven years and having potentially left his family in the Greek city before his journey to Rome. Claims of direct blood lineage from Simon Peter among the old population of Antioch existed in the 1st century and continue to exist today, notably by certain Semaan families of modern day Syria and Lebanon. Historians have furnished other evidence of Peter's sojourn in Antioch. Subsequent tradition held that Peter had been the first Patriarch of Antioch.

Eusebius of Caesarea (Eusebius Caesariensis, ca 260 - ca 340), in his "Historia Ecclesiastica", while naming some of the Seventy Disciples of Jesus, says:

In the epilogue of the Gospel of John, Jesus hints at the death by which Peter would glorify God, saying "…when you are old you will stretch out your hands, and another will dress you and take you where you do not want to go." This is interpreted by some as a reference to Peter's crucifixion.

According to the 1911 Catholic Encyclopedia, St. Peter labored in Rome during the last portion of his life, and there ended his life by martyrdom. The death of St. Peter is attested to by Tertullian at the end of the 2nd century, and by Origen in Eusebius, Church History III.1. Origen says: "Peter was crucified at Rome with his head downwards, as he himself had desired to suffer." This is why an upside down cross is generally accepted as a symbol of Peter, who would not have considered himself worthy enough to die the same way as his Savior.

St. Clement of Rome identifies Peter and Paul as the outstanding heroes of the faith. Papias reported that the Gospel of Mark was based on Peter's memoirs, a tradition still accepted by some scholars today.

The mention in the New Testament of the death of Peter says that Jesus indicated its form by saying: "You will stretch out your hands, and someone else will dress you and lead you where you do not want to go." Early church tradition (as indicated below) says Peter probably died by crucifixion (with arms outstretched) at the time of the Great Fire of Rome of the year 64. Margherita Guarducci, who led the research leading to the rediscovery of Peter’s tomb in its last stages (1963 - 1968), concludes Peter died on 13 October AD 64 during the festivities on the occasion of the “dies imperii” of Emperor Nero. This took place three months after the disastrous fire that destroyed Rome for which the emperor wished to blame the Christians. This “dies imperii” (regnal day anniversary) was an important one, exactly ten years after Nero ascended to the throne, and it was ‘as usual’ accompanied by much bloodshed. Traditionally, Roman authorities sentenced him to death by crucifixion. According to the apocryphal Acts of Peter, he was crucified head down. Tradition also locates his burial place where the Basilica of Saint Peter was later built, directly beneath the Basilica's high altar.

Clement of Rome, in his Letter to the Corinthians (Chapter 5), written c. 80 - 98, speaks of Peter's martyrdom in the following terms: "Let us take the noble examples of our own generation. Through jealousy and envy the greatest and most just pillars of the Church were persecuted, and came even unto death… Peter, through unjust envy, endured not one or two but many labors, and at last, having delivered his testimony, departed unto the place of glory due to him."

The apocryphal Acts of Peter is also thought to be the source for the tradition about the famous phrase "Quo vadis, Domine?" (or "Pou Hupageis, Kurie?" which means, "Where are you going, Master?"). According to the story, Peter, fleeing Rome to avoid execution, asked the question of a vision of Jesus, to which Jesus allegedly responded that he was "going to Rome to be crucified again." On hearing this, Peter decided to return to the city to accept martyrdom. This story is commemorated in an Annibale Carracci painting. The Church of Quo Vadis, near the Catacombs of Saint Callistus, contains a stone in which Jesus' footprints from this event are supposedly preserved, though this was apparently an ex-voto from a pilgrim, and indeed a copy of the original, housed in the Basilica of St Sebastian.

The ancient historian Josephus describes how Roman soldiers would amuse themselves by crucifying criminals in different positions, and it is likely that this would have been known to the author of the Acts of Peter. The position attributed to Peter's crucifixion is thus plausible, either as having happened historically or as being an invention by the author of the Acts of Peter. Death, after crucifixion head down, is unlikely to be caused by suffocation, the usual "cause of death in ordinary crucifixion".

A medieval tradition was that the Mamertine Prison in Rome is the place where Peter was imprisoned before his execution. Catholic tradition holds that his inverted crucifixion occurred on the spot now occupied by the Clementine Chapel in the grottoes of Saint Peter's Basilica. In 1950, human bones were found buried underneath the altar of St. Peter's Basilica. The bones have been claimed by many to have been those of Peter. An attempt to contradict these claims was made in 1953 by the excavation of what some believe to be St Peter's tomb in Jerusalem. However along with supposed tomb of Peter bearing his previous name Simon, tombs bearing the names of Jesus, Mary, James, John, and the rest of the apostles were also found at the same excavation — though all these names were very common among Jews at the time.

In the 1960s, some previously discarded debris from the excavations beneath St Peter's Basilica were re-examined, and the bones of a male person were identified. A forensic examination found them to be a male of about 61 years of age from the 1st century. This caused Pope Paul VI in 1968 to announce them most likely to be the relics of Apostle Peter.

Further doubt on finding bones in Rome is cast by Pope Vitalian's letter to King Oswy of the Britons (665 AD), offering him the remains (then called relics) of the apostle Peter and Paul, along with those of the Holy Martyrs Laurentius, John, Gregory and Pancratius as a reward for the emergence of British faith.

The See of Rome is traditionally said to be founded by Peter and Paul, see also Primacy of Simon Peter, who had invested it with apostolic authority. The New Testament says nothing directly about Peter's connection to Rome, but an early Catholic tradition supports such a connection.

That Peter was bishop of Rome is corroborated by both positive and negative evidence. However, some historians have challenged this traditional view of Peter's role in the early Roman Church. Still, most Catholic and Protestant scholars, and many scholars in general, conclude that Peter was indeed martyred in Rome under Nero. In 2009 Otto Zwierlein concluded in a critical study that "there is not a single piece of reliable literary evidence (and no archaeological evidence either) that Peter ever was in Rome."

1 Clement, a document that has been dated from the 90s to the 120s, is one of the earliest sources adduced in support of Peter's stay in Rome, but questions have been raised about the text's authenticity and whether it has any knowledge about Peter's life beyond what is contained in the New Testament Acts. The Letter to the Romans attributed to St. Ignatius of Antioch implies that Peter and Paul had special authority over the Roman church, telling the Roman Christians: "I do not command you, as Peter and Paul did" (ch. 4). However, the authenticity of this document and its traditional dating to c. 105 - 10 have also been questioned, and it may date from the final decades of the 2nd century.

Later in the 2nd century, Irenaeus of Lyons believed that Peter and Paul had been the founders of the Church in Rome and had appointed Linus as bishop. In Against Heresies (Book III, Chapter III, paragraphs 2-3), Irenaeus wrote:

Tertullian also writes: "But if you are near Italy, you have Rome, where authority is at hand for us too. What a happy church that is, on which the apostles poured out their whole doctrine with their blood; where Peter had a passion like that of the Lord, where Paul was crowned with the death of John (the Baptist, by being beheaded)." Dionysius of Corinth also serves as a late 2nd century witness to the tradition. He wrote: "You (Pope Soter) have also, by your very admonition, brought together the planting that was made by Peter and Paul at Rome and at Corinth; for both of them alike planted in our Corinth and taught us; and both alike, teaching similarly in Italy, suffered martyrdom at the same time". Later tradition, first found in Saint Jerome, attributes to Peter a 25 year episcopate (or apostolate) in Rome.

According to the Catholic Encyclopedia, there was a Christian community at Rome before either Peter or Paul arrived there:

Paul's Epistle to the Romans 16 (c. 58) attests to a large Christian community already there, although he does not mention Peter.

Two sayings are attributed to Peter in the gnostic Gospel of Thomas. In the first, Peter compares Jesus to a "just messenger." In the second, Peter asks Jesus to "make Mary leave us, for females don't deserve life,"

In the Apocalypse of Peter, Peter holds a dialogue with Jesus about the parable of the fig tree and the fate of sinners.

In the Gospel of Mary, whose text is largely fragmented, Peter appears to be jealous of "Mary" (probably Mary Magdalene). He says to the other disciples, "Did He really speak privately with a woman and not openly to us? Are we to turn about and all listen to her? Did He prefer her to us?" In reply to this, Levi says "Peter, you have always been hot tempered."

Other non-canonical texts that attribute sayings to Peter include the Secret Book of James and the Acts of Peter.

In the Fayyum Fragment of the end of the 3rd century, Jesus predicts that Peter will deny him three times before a cock crows (on the following morning). The account is similar to that of the canonical gospels, especially the Gospel of Mark, either an abbreviation of the account in the Synoptics or a source text on which they were based.

The fragmentary Gospel of Peter, attributed to Peter, contains an account of the death of Jesus differing significantly from the canonical gospels. It contains little information about Peter himself, except that after the discovery of the empty tomb, "I, Simon Peter, and Andrew my brother, took our fishing nets and went to the sea."

Joseph Smith, the founder of Mormonism, recorded in multiple revelations that Peter appeared to him and Oliver Cowdery in 1829 in order to bestow the apostleship and keys of the kingdom as part of a restoration of priesthood authority.

According to Catholic belief, Peter was the first Bishop of Rome and chief pastor of the entire Catholic Church — the Vicar of Christ upon Earth. Although Peter never bore the title of "Pope", or "Vicar of Christ", the Catholic Church believes him to be the first Pope. Therefore, they consider every pope to be Peter's successor and the rightful superior of all other bishops.

The Catholic Church's recognition of Peter as head of its church on Earth (with Christ being its heavenly head) is based on its interpretation of two passages from the Canonical Gospels of the New Testament; as well as Sacred Tradition. The first passage is John 21:15-17 which is: "Feed my lambs, feed my lambs, feed my sheep" (within the Greek it is Ποίμαινε i.e., to feed and rule [as a Shepherd]., v. 16 while Βόσκε i.e., to feed., for v.15 & v. 17) — which is seen by Catholics as Christ promising the spiritual supremacy to Peter. The Catholic Encyclopedia sees in this passage Jesus "charging [Peter] with the superintendency of all his sheep, without exception; and consequently of his whole flock, that is, of his own church”. The second passage is Matthew 16: 17-20:

ܐܳܦ݂ ܐܶܢܳܐ ܐܳܡܰܪ ܐ݈ܢܳܐ ܠܳܟ݂ ܕ݁ܰܐܢ݈ܬ݁ ܗ݈ܽܘ ܟ݁ܺܐܦ݂ܳܐ ܘܥܰܠ ܗܳܕ݂ܶܐ ܟ݁ܺܐܦ݂ܳܐ ܐܶܒ݂ܢܶܝܗ ܠܥܺܕ݈݁ܬ݁ܝ ܘܬ݂ܰܪܥܶܐ ܕ݁ܰܫܝܽܘܠ ܠܳܐ ܢܶܚܣܢܽܘܢܳܗ܂

Pétrus (Πέτρος) and pétra (πέτρᾳ) are the Greek equivalent to the Syriac Cephah (ܟ݁ܺܐܦ݂ܳܐ) which means "rock", and there is no difference at all between Pétrus and pétra.

In reference to Peter's occupation before becoming an Apostle, the popes wear the Fisherman's Ring, which bears an image of the saint casting his nets from a fishing boat. The keys used as a symbol of the pope's authority refer to the "keys of the kingdom of Heaven" promised to Peter. The terminology of this "commission" of Peter is unmistakably parallel to the commissioning of Eliakim ben Hilkiah in Isaiah 22:15-23. Peter is often depicted in both Western and Eastern Christian art holding a key or a set of keys.

Though the authenticity of this account has been challenged, the general consensus is that these are Jesus' words.

The Roman Martyrology assigns 29 June as the feast day of both Peter and Paul, without thereby declaring that to be the day of their deaths. St. Augustine of Hippo says in his Sermon 295: "One day is assigned for the celebration of the martyrdom of the two apostles. But those two were one. Although their martyrdom occurred on different days, they were one."

This is also the feast of both Apostles in the calendar of the Eastern Orthodox Church.

In the Roman Rite, the feast of the Chair of Saint Peter is celebrated on 22 February, and the anniversary of the dedication of the two papal basilicas of Saint Peter's and Saint Paul's outside the Walls is held on 18 November.

Before Pope John XXIII's revision in 1960, the Roman Calendar also included on 18 January another feast of the Chair of Saint Peter (denominated the Chair of Saint Peter in Rome, while the February feast was then called that of the Chair of Saint Peter at Antioch), and on 1 August the feast of Saint Peter in Chains.

In the early 4th century, the Emperor Constantine I decided to honor Peter with a large basilica. Because the precise location of Peter's burial was so firmly fixed in the belief of the Christians of Rome, the church to house the basilica had to be erected on a site that was not convenient to construction. The slope of the Vatican Hill had to be excavated, even though the church could much more easily have been built on level ground only slightly to the south. There were also moral and legal issues, such as demolishing a cemetery to make room for the building. The focal point of the Basilica, both in its original form and in its later complete reconstruction, is the altar located over what is said to be the point of Peter's burial.

A major debate between Catholics and Protestants centers on Matthew 16:18 where Jesus tells Peter: "You are Peter, and on this rock I will build my Church..." Catholics interpret the verse as saying that Jesus would build his church on Peter, the apostle. The traditional Catholic interpretation has been that Jesus told Peter (Rock) that he would build his Church on this Rock (Peter), and that Peter was made the shepherd of the apostolic flock — hence their assertion of the Primacy of the Roman Pontiff.

In the original Greek the word translated as "Peter" is Πέτρος (Petros) and that translated as "rock" is πέτρα (petra), two words that, while not identical, give an impression of one of many times when Jesus used a play on words. Furthermore, since Jesus presumably spoke to Peter in their native Aramaic language, he would have used kepha in both instances. The Peshitta Text and the Old Syriac text use the word "kepha" for both "Peter" and "rock" in Matthew 16:18. John 1:42 says Jesus called Simon "Cephas", as does Paul in some letters. He was instructed by Christ to strengthen his brethren, i.e., the apostles. Peter also had a leadership role in the early Christian church at Jerusalem according to The Acts of the Apostles chapters 1-2, 10-11, and 15.

Early Catholic Latin and Greek writers (such as St. John Chrysostom) considered the "foundation rock" as applying to both Peter personally and his confession of faith (or the faith of his confession) symbolically, as well as seeing Christ's promise to apply more generally to his twelve apostles and the Church at large. This "double meaning" interpretation is present in the current Catechism of the Catholic Church.

Protestant counter-claims to the Catholic interpretation are largely based on the difference between the Greek words translated "Rock" in the Matthean passage. In classical Attic Greek petros generally meant "pebble," while petra meant "boulder" or "cliff." Accordingly, taking Peter's name to mean "pebble," they argue that the "rock" in question cannot have been Peter, but something else, either Jesus himself, or the faith in Jesus that Peter had just professed. However, the New Testament was written in Koiné Greek, not Attic Greek, and some authorities say no significant difference existed between the meanings of petros and petra.

However, even though the feminine noun petra is translated as rock in the phrase "on this rock I will build my church," the word petra (πέτρα in Greek) is also used at 1 Cor. 10:4 in describing Jesus Christ, which reads: "They all ate the same spiritual food and drank the same spiritual drink; for they drank from the spiritual rock that accompanied them, and that rock was Christ."

Although Matthew 16 is used as a primary proof-text for the Catholic doctrine of Papal supremacy, Protestant scholars say that prior to the Reformation of the 16th century, Matthew 16 was very rarely used to support papal claims. Their position is that most of the early and medieval Church interpreted the 'rock' as being a reference either to Christ or to Peter's faith, not Peter himself. They understand Jesus' remark to have been his affirmation of Peter's testimony that Jesus was the Son of God.

Despite this claim, many Fathers saw a connection between Matthew 16:18 and the primacy of Peter and his office, such as Tertullian, writing: the Lord said to Peter, ‘On this rock I will build my Church, I have given you the keys of the kingdom of heaven [and] whatever you shall have bound or loosed on earth will be bound or loosed in heaven’ [Matt. 16:18–19]. . . . Upon you, he says, I will build my Church; and I will give to you the keys, not to the Church.

Other theologically conservative Christians, including Confessional Lutherans, also rebut comments made by Karl Keating and D.A. Carson who claim that there is no distinction between the words petros and petra in Koine Greek. The Lutheran theologians state that the dictionaries of Koine/NT Greek, including the authoritative Bauer - Danker - Arndt - Gingrich Lexicon, indeed list both words and the passages that give different meanings for each. The Lutheran theologians further note that:

Partial support for the Catholic position comes from one of Protestantism's most distinguished Church historians, Oscar Cullmann, a Lutheran theologian. He disagrees with Luther and the Protestant reformers who held that by "rock" Christ did not mean Peter, but meant either himself or the faith of His followers. He believes the meaning of the original Aramaic is very clear: that "Kepha" was the Aramaic word for "rock", and that it was also the name by which Christ called Peter.

Yet, Cullmann sharply rejects the Catholic claim that Peter began the papal succession. He writes: "In the life of Peter there is no starting point for a chain of succession to the leadership of the church at large." While he believes the Matthew text is entirely valid and is in no way spurious, he says it cannot be used as "warrant of the papal succession."

Cullmann concludes that while Peter was the original head of the apostles, Peter was not the founder of any visible church succession.

There are other Protestant scholars who also partially defend the historical Catholic position about "Rock." Taking a somewhat different approach from Cullman, they point out that the Gospel of Matthew was not written in the classical Attic form of Greek, but in the Hellenistic Koine dialect in which there is no distinction in meaning between petros and petra. Moreover, even in Attic Greek, in which the regular meaning of petros was a smallish "stone," there are instances of its use to refer to larger rocks, as in Sophocles, Oedipus at Colonus v. 1595, where petros refers to a boulder used as a landmark, obviously something more than a pebble. In any case, a petros / petra distinction is irrelevant considering the Aramaic language in which the phrase might well have been spoken. In Greek, of any period, the feminine noun petra could not be used as the given name of a male, which may explain the use of Petros as the Greek word with which to translate Aramaic Kepha.

Yet, still other Protestant scholars believe that Jesus in fact did mean to single out Peter as the very rock which he will build upon, but that the passage does nothing to indicate a continued succession of Peter's implied position. They assert that Matthew uses the demonstrative pronoun taute, which allegedly means "this very" or this same, when he refers to the rock on which Jesus' church will be built. He also uses the Greek word for "and", kai. It is alleged that when a demonstrative pronoun is used with kai, the pronoun refers back to the preceding noun. The second rock Jesus refers to must then be the same rock as the first one; and if Peter is the first rock he must also be the second.

The Eastern Orthodox Church regards Apostle Peter, together with Apostle Paul, as "Preeminent Apostles". Another title used for Peter is Coryphaeus, which could be translated as "Choir - director", or lead singer. The church recognizes Apostle Peter's leadership role in the early church, especially in the very early days at Jerusalem, but does not consider him to have had any "princely" role over his fellow Apostles.

The New Testament is not seen by the Orthodox as supporting any extraordinary authority for Peter with regard to faith or morals. The Orthodox also hold that Peter did not act as leader at the Council of Jerusalem, but as merely one of a number who spoke. The final decision regarding the non-necessity of circumcision (and certain prohibitions) was spelled out by James, the Brother of the Lord (though Catholics hold James merely reiterated and fleshed out what Peter had said, regarding the latter's earlier divine revelation regarding the inclusion of Gentiles).

Eastern and Oriental Orthodox do not recognize the Bishop of Rome as the successor of St. Peter but the Ecumenical Patriarch of Constantinople sends a delegation each year to Rome to participate in the celebration of the feast of Sts. Peter and Paul. In the Ravenna Document of 13 October 2007, the representatives of the Eastern Orthodox Church agreed that "Rome, as the Church that 'presides in love' according to the phrase of St. Ignatius of Antioch (To the Romans, Prologue), occupied the first place in the taxis, and that the bishop of Rome was therefore the protos among the patriarchs, if the Papacy unites with the Orthodox Church. They disagree, however, on the interpretation of the historical evidence from this era regarding the prerogatives of the bishop of Rome as protos, a matter that was already understood in different ways in the first millennium."

With regard to Jesus' words to Peter, "Thou art Peter and upon this rock I will build my church", the Orthodox hold Christ is referring to the confession of faith, not the person of Peter as that upon which he will build the church. This is allegedly shown by the fact that the original Greek uses the feminine demonstrative pronoun when he says "upon this rock" (ταύτῃ τῇ πέτρᾳ); whereas, grammatically, if he had been referring to Peter, he would allegedly have used the masculine. This "gender distinction" argument is also held by some Protestants.

In the Orthodox Daily Office every Thursday throughout the year is dedicated to the Holy Apostles, including St. Peter. There are also two feast days in the year which are dedicated to him:

The Fathers of the Syriac Orthodox Church tried to give a theological interpretation to the primacy of Apostle Peter. They were fully convinced of the unique office of Peter in the primitive Christian community. Ephrem, Aphrahat and Maruthas who were supposed to be the best exponents of the early Syriac tradition unequivocally acknowledge the office of Peter.

The Syriac Fathers following the rabbinic tradition call Jesus “Kepha” for they see “rock” in the Old Testament as a messianic Symbol (yet the Old Maronite Syriacs of Lebanon still refer at Saint Peter as "Saint Simon the Generous" or Simon Karam") . When Christ gave his own name “Kepha” to Simon he was giving him participation in the person and office of Christ. Christ who is the Kepha and shepherd made Simon the chief shepherd in his place and gave him the very name Kepha and said that on Kepha he would build the Church. Aphrahat shared the common Syriac tradition. For him Kepha is in fact another name of Jesus, and Simon was given the right to share the name. The person who receives somebody else’s name also obtains the rights of the person who bestows the name. Aphrahat makes the stone taken from Jordan a type of Peter. He says Jesus son of Nun set up the stones for a witness in Israel; Jesus our Savior called Simon Kepha Sarirto and set him as the faithful witness among nations.

Again he says in his commentary on Deuteronomy that Moses brought forth water from “rock” (Kepha) for the people and Jesus sent Simon Kepha to carry his teachings among nations. Our Lord accepted him and made him the foundation of the Church and called him Kepha. When he speaks about transfiguration of Christ he calls him Simon Peter, the foundation of the Church. Ephrem also shared the same view. In Armenian version of De Virginitate records Peter the Rock shunned honor Who was the head of the Apostles. In a mimro of Efrem found in Holy Week Liturgy points to the importance of Peter.

Both Aphrahat and Ephrem represent the authentic tradition of the Syrian Church. The different orders of liturgies used for sanctification of Church building, marriage, ordination etc. reveal that the primacy of Peter is a part of living faith of the Church.

Muslims accept Jesus as a prophet of Islam. The Qur'an also speaks of Jesus's disciples but does not mention their names, instead referring to them as "helpers to the prophet of God". Muslim exegesis and Qur'an commentary, however, names them and includes Peter among the disciples. An old tradition, which involves the legend of Habib the Carpenter, mentions that Peter was one of the three disciples sent to Antioch to preach to the people there.

Shia Muslims see a parallel in the figure of Peter to Ali at Muhammad's time. They look upon Ali as being the vicegerent, with Muhammad being the prophet; likewise, they see Peter as the vicegerent, behind Jesus the prophet and Masih. Peter's role as the first proper leader of the church is also seen by Shia's to be a parallel to their belief in Ali as the first caliph after Muhammad.Traditionally, two canonical epistles (1 and 2 Peter) and several apocryphal works have been attributed to Peter.

The New Testament includes two letters (epistles) ascribed to Peter. Both demonstrate a high quality of cultured and urban Greek, at odds with the linguistic skill that would ordinarily be expected of an Aramaic-speaking fisherman, who would have learned Greek as a second or third language. However, the author of the first epistle explicitly claims to be using a secretary (see below), and this explanation would allow for discrepancies in style without entailing a different source. The textual features of these two epistles are such that a majority of scholars doubt that they were written by the same hand. This means at the most that Peter could not have authored both, or at the least that he used a different secretary for each letter. Some scholars argue that theological differences imply different sources, and point to the lack of references to 2 Peter among the early Church Fathers.

Of the two epistles, the first epistle is considered the earlier. A number of scholars have argued that the textual discrepancies with what would be expected of the biblical Peter are due to it having been written with the help of a secretary or as an amanuensis. Indeed in the first epistle the use of a secretary is clearly described: "By Silvanus, a faithful brother unto you, as I suppose, I have written briefly, exhorting, and testifying that this is the true grace of God wherein ye stand". Thus, in regards to at least the first epistle, the claims that Peter would have written Greek poorly seem irrelevant. The letter refers to Roman persecution of Christians, apparently of an official nature. The Roman historian Tacitus and the biographer Suetonius do both record that Nero persecuted Christians, and Tacitus dates this to immediately after the fire that burned Rome in 64. Christian tradition, for example Eusebius of Caesarea(History book 2, 24.1), has maintained that Peter was killed in Nero's persecution, and thus had to assume that the Roman persecution alluded to in 1 Peter must be this Neronian persecution. On the other hand, many modern scholars argue that 1 Peter refers to the persecution of Christians in Asia Minor during the reign of the emperor Domitian (81-96), as the letter is explicitly addressed to Jewish Christians from that region:

Those scholars who believe that the epistle dates from the time of Domitian argue that Nero's persecution of Christians was confined to the city of Rome itself, and did not extend to the Asian provinces mentioned in 1 Pet 1:1-2.

The Second Epistle of Peter, on the other hand, appears to have been copied, in part, from the Epistle of Jude, and some modern scholars date its composition as late as c. 150. Some scholars argue the opposite, that the Epistle of Jude copied 2 Peter, while others contend an early date for Jude and thus observe that an early date is not incompatible with the text. Many scholars have noted the similarities between the apocryphal Second Epistle of Clement (2nd century) and 2 Peter. Second Peter may be earlier than 150, there are a few possible references to it that date back to the 1st century or early 2nd century, e.g., 1 Clement written in c. AD 96, and the later church historian Eusebius claimed that Origen had made reference to the epistle before 250. Even in early times there was controversy over its authorship, and 2 Peter was often not included in the Biblical Canon; it was only in the 4th century that it gained a firm foothold in the New Testament, in a series of synods. In the east the Syrian Orthodox Church still did not admit it into the canon until the 6th century.

Traditionally, the Gospel of Mark was said to have been written by a person named John Mark, and that this person was an assistant to Peter, hence its content was traditionally seen as the closest to Peter's viewpoint. According to Eusebius's Ecclesiastical History, Papias recorded this belief from John the Presbyter:

Based on these quotes, and on the Christian tradition, the information in Mark's Gospel about St. Peter would be based on eyewitness material. It should be noted, however, that some scholars (for differing reasons) dispute the attribution of the Gospel of Mark to its traditional author. The gospel itself is anonymous, and the above passages are the oldest surviving written testimony to its authorship.

There are also a number of other apocryphal writings, not recognized by the Church, that have been either attributed to or written about St. Peter. They were from antiquity regarded as pseudepigrapha. These include:

The earliest portrait of St. Peter dates back to the 4th century and was located in 2010. In traditional iconography, Peter has been shown very consistently since early Christian art as an oldish thick-set man with a "slightly combative" face and a short beard, and usually white hair, sometimes balding. He thus contrasts with Saint Paul who is bald except at the sides, with a longer beard and often black hair, and thinner in the face. One exception to this is in Anglo-Saxon art, where he typically lacks a beard. Both Peter and Paul are shown thus as early as the 4th century Catacombs of Marcellinus and Peter in Rome. Later in the Middle Ages his attribute is one or two large keys in his hand or hanging from his belt, first seen in the early 8th century. More than many medieval attributes, this continued to be depicted in the Renaissance and afterwards. By the 15th century Peter is more likely to be bald on the top of his head in the Western church, but he continues to have a good head of hair in Orthodox icons.

The depiction of Saint Peter as literally the keeper of the gates of heaven, popular with modern cartoonists is not found in traditional religious art, but Peter usually heads groups of saints flanking God in heaven, on the right hand side (viewer's left) of God. Narrative images of Peter include several scenes from the Life of Christ where he is mentioned in the Gospels, and he is often identifiable in scenes where his presence is not specifically mentioned. Usually he stands nearest to Christ. In particular, depictions of the Arrest of Christ usually include Peter cutting off the ear of one of the soldiers. Scenes without Jesus include his distinctive martyrdom, his rescue from prison, and sometimes his trial. In the Counter-Reformation scenes of Peter hearing the cock crow for the third time became popular, as a representation of repentance and hence the Catholic sacrament of Confession or Repentance.

Over the years "St. Peter" has evolved into a stock character that is now widely used in jokes, cartoons, comedies, dramas, and plays. Such caricatures almost all play upon Peter's role as the "keeper of the keys of the kingdom of heaven" in Matthew 16:19, on the basis of which he is often depicted as an elderly, bearded man who sits at the pearly gates that serve as heaven's main entrance, often portrayed as a sort of hotel-style doorman / bouncer who personally interviews prospective entrants into Heaven, often seated behind a desk, or standing at a lectern. He usually has a big book in which the names of the saved are written.

Pope Vitalian sent filings from Apostle Peter's chains to Oswy, King of Northumbria in the 7th century.

Peter's remains continue to be subject of investigation, but his tomb is located under Saint Peter's Basilica in the Vatican, which was announced by Pope Pius XII on Christmas Day in 1950 after years of painstaking research.

Many Protestant scholars accept the traditional story of Peter's martyrdom in Rome. Some Protestants, however, have rejected Peter's martyrdom as a later invention, arguing that evidence of Peter exists only in Biblical accounts.

It has also been claimed that there was a serious division between Peter's Jewish Christian party and Paul's Hellenizing party, seen in e.g. the Incident at Antioch, which later Christian accounts have downplayed.