Samuel Taylor Coleridge (21 October 1772 – 25 July 1834) was an English poet, Romantic, literary critic and philosopher who, with his friend William Wordsworth, was a founder of the Romantic Movement in England and a member of the Lake Poets. He is probably best known for his poems The Rime of the Ancient Mariner and Kubla Khan, as well as for his major prose work Biographia Literaria. His critical work, especially on Shakespeare, was highly influential, and he helped introduce German idealist philosophy to English speaking culture. He coined many familiar words and phrases, including the celebrated suspension of disbelief. He was a major influence, via Emerson, on American transcendentalism.

Throughout his adult life, Coleridge suffered from crippling bouts of anxiety and depression; it has been speculated that he suffered from bipolar disorder, a mental disorder which was unknown during his life. Coleridge chose to treat these episodes with opium, becoming an addict in the process.

Coleridge was born on 21 October 1772 in the rural town of Ottery St Mary, Devon, England. Samuel's father, the Reverend John Coleridge (1718 – 1781), was a well respected vicar of the parish and headmaster of Henry VIII's Free Grammar School at Ottery. He had three children by his first wife. Samuel was the youngest of ten by Reverend Coleridge's second wife, Anne Bowden (1726 – 1809). Coleridge suggests that he "took no pleasure in boyish sports" but instead read "incessantly" and played by himself. After John Coleridge died in 1781, the then 8 year old Samuel was sent to Christ's Hospital, a charity school founded in the 16th century in Greyfriars, London, where he remained throughout his childhood, studying and writing poetry. At that school Coleridge became friends with Charles Lamb, a schoolmate, and studied the works of Virgil and William Lisle Bowles. In one of a series of autobiographical letters written to Thomas Poole, Coleridge wrote: "At six years old I remember to have read Belisarius, Robinson Crusoe, and Philip Quarll – and then I found the Arabian Nights' Entertainments – one tale of which (the tale of a man who was compelled to seek for a pure virgin) made so deep an impression on me (I had read it in the evening while my mother was mending stockings) that I was haunted by spectres whenever I was in the dark – and I distinctly remember the anxious and fearful eagerness with which I used to watch the window in which the books lay – and whenever the sun lay upon them, I would seize it, carry it by the wall, and bask, and read."

However, Coleridge seems to have appreciated his teacher, as he wrote in recollections of his schooldays in Biographia Literaria:

"I enjoyed the inestimable advantage of a very sensible, though at the same time, a very severe master [...] At the same time that we were studying the Greek Tragic Poets, he made us read Shakspeare and Milton as lessons: and they were the lessons too, which required most time and trouble to bring up, so as to escape his censure. I learnt from him, that Poetry, even that of the loftiest, and, seemingly, that of the wildest odes, had a logic of its own, as severe as that of science; and more difficult, because more subtle, more complex, and dependent on more, and more fugitive causes. [...] In our own English compositions (at least for the last three years of our school education) he showed no mercy to phrase, metaphor, or image, unsupported by a sound sense, or where the same sense might have been conveyed with equal force and dignity in plainer words... In fancy I can almost hear him now, exclaiming Harp? Harp? Lyre? Pen and ink, boy, you mean! Muse, boy, Muse? your Nurse's daughter, you mean! Pierian spring? Oh aye! the cloister-pump, I suppose! [...] Be this as it may, there was one custom of our master's, which I cannot pass over in silence, because I think it ... worthy of imitation. He would often permit our theme exercises, ... to accumulate, till each lad had four or five to be looked over. Then placing the whole number abreast on his desk, he would ask the writer, why this or that sentence might not have found as appropriate a place under this or that other thesis: and if no satisfying answer could be returned, and two faults of the same kind were found in one exercise, the irrevocable verdict followed, the exercise was torn up, and another on the same subject to be produced, in addition to the tasks of the day.

Throughout life, Coleridge idealized his father as pious and innocent, while his relationship with his mother was more problematic. His childhood was characterized by attention seeking, which has been linked to his dependent personality as an adult. He was rarely allowed to return home during the school term, and this distance from his family at such a turbulent time proved emotionally damaging. He later wrote of his loneliness at school in the poem Frost at Midnight: "With unclosed lids, already had I dreamt/ Of my sweet birthplace."

From 1791 until 1794, Coleridge attended Jesus College, Cambridge. In 1792, he won the Browne Gold Medal for an ode that he wrote on the slave trade. In December 1793, he left the college and enlisted in the Royal Dragoons using the false name "Silas Tomkyn Comberbache", perhaps because of debt or because the girl that he loved, Mary Evans, had rejected him. Afterwards, he was rumored to have had a bout with severe depression. His brothers arranged for his discharge a few months later under the reason of "insanity" and he was readmitted to Jesus College, though he would never receive a degree from Cambridge.

At the university, he was introduced to political and theological ideas then considered radical, including those of the poet Robert Southey. Coleridge joined Southey in a plan, soon abandoned, to found a utopian commune like society, called Pantisocracy, in the wilderness of Pennsylvania. In 1795, the two friends married sisters Sarah and Edith Fricker, but Coleridge's marriage proved unhappy. He grew to detest his wife, whom he only married because of social constraints. He eventually separated from her. Coleridge made plans to establish a journal, The Watchman, which would print every eight days in order to avoid a weekly newspaper tax. The first issue of the short lived journal was published in March 1796; it ceased publication by May of that year.

The years 1797 and 1798, during which he lived in what is now known as Coleridge Cottage, in Nether Stowey, Somerset, were among the most fruitful of Coleridge's life. In 1795, Coleridge met poet William Wordsworth and his sister Dorothy. (Wordsworth, having visited him and being enchanted by the surroundings, rented Alfoxton Park, a little over three miles [5 km] away.) Besides the Rime of The Ancient Mariner, he composed the symbolic poem Kubla Khan, written — Coleridge himself claimed — as a result of an opium dream, in "a kind of a reverie"; and the first part of the narrative poem Christabel. The writing of Kubla Khan, written about the Asian emperor Kublai Khan, was said to have been interrupted by the arrival of a "Person from Porlock" — an event that has been embellished upon in such varied contexts as science fiction and Nabokov's Lolita. During this period, he also produced his much praised "conversation" poems This Lime-Tree Bower My Prison, Frost at Midnight, and The Nightingale.

In 1798, Coleridge and Wordsworth published a joint volume of poetry, Lyrical Ballads, which proved to be the starting point for the English romantic movement. Though the productive Wordsworth contributed more poems, Coleridge's first version of The Rime of the Ancient Mariner was the longest poem and drew more immediate attention than anything else in the volume. In the spring Coleridge temporarily took over for Rev. Joshua Toulmin at Taunton's Mary Street Unitarian Chapel while Rev. Toulmin grieved over the drowning death of his daughter Jane. Poetically commenting on Toulmin's strength, Coleridge wrote in a 1798 letter to John Prior Estlin, "I walked into Taunton (eleven miles) and back again, and performed the divine services for Dr. Toulmin. I suppose you must have heard that his daughter, (Jane, on 15 April 1798) in a melancholy derangement, suffered herself to be swallowed up by the tide on the sea-coast between Sidmouth and Bere (sic. Beer). These events cut cruelly into the hearts of old men: but the good Dr. Toulmin bears it like the true practical Christian, – there is indeed a tear in his eye, but that eye is lifted up to the Heavenly Father.

In the autumn of 1798, Coleridge and Wordsworth left for a stay in Germany; Coleridge soon went his own way and spent much of his time in university towns. During this period, he became interested in German philosophy, especially the transcendental idealism of Immanuel Kant, and in the literary criticism of the 18th century dramatist Gotthold Lessing. Coleridge studied German and, after his return to England, translated the dramatic trilogy Wallenstein by the German Classical poet Friedrich Schiller into English.

In 1799, Coleridge and Wordsworth stayed at Thomas Hutchinson's farm on the Tees at Sockburn, near Darlington. There both of them fell in love, Coleridge with Sara Hutchinson ('Asra'), and Wordsworth with her sister Mary, whom he married in 1802. It was at Sockburn that Coleridge wrote his ballad poem Love, addressed to Sara. The knight mentioned is the mailed figure on the Conyers tomb in ruined Sockburn church. The figure has a wyvern at his feet, a reference to the Sockburn worm slain by Sir John Conyers (and a possible source for Lewis Carroll's Jabberwocky). The worm was supposedly buried under the rock in the nearby pasture; this was the 'greystone' of Coleridge's first draft, later transformed into a 'mount'. The poem was a direct inspiration for John Keats' famous poem La Belle Dame Sans Merci.

Coleridge's early intellectual debts, besides German idealists like Kant and critics like Lessing, were first to William Godwin's Political Justice, especially during his Pantisocratic period, and to David Hartley's Observations on Man, which is the source of the psychology which is found in Frost at Midnight. Hartley argued that one becomes aware of sensory events as impressions, and that "ideas" are derived by noticing similarities and differences between impressions and then by naming them. Connections resulting from the coincidence of impressions create linkages, so that the occurrence of one impression triggers those links and calls up the memory of those ideas with which it is associated (See Dorothy Emmet, "Coleridge and Philosophy"). Coleridge was critical of the literary taste of his contemporaries, and a literary conservative insofar as he was afraid that the lack of taste in the ever growing masses of literate people would mean a continued desecration of literature itself.

In 1800, he returned to England and shortly thereafter settled with his family and friends at Keswick in the Lake District of Cumberland to be near Grasmere, where Wordsworth had moved. Soon, however, he was beset by marital problems, illnesses, increased opium dependency, tensions with Wordsworth, and a lack of confidence in his poetic powers, all of which fueled the composition of Dejection: An Ode and an intensification of his philosophical studies.

In 1804, he travelled to Sicily and Malta, working for a time as Acting Public Secretary of Malta under the Commissioner, Alexander Ball, a task he performed quite successfully. However, he gave this up and returned to England in 1806. Dorothy Wordsworth was shocked at his condition upon his return. From 1807 to 1808, Coleridge returned to Malta and then travelled in Sicily and Italy, in the hope that leaving Britain's damp climate would improve his health and thus enable him to reduce his consumption of opium. Thomas de Quincey alleges in his Recollections of the Lakes and the Lake Poets that it was during this period that Coleridge became a full-blown opium addict, using the drug as a substitute for the lost vigour and creativity of his youth. It has been suggested, however, that this reflects de Quincey's own experiences more than Coleridge's. His opium addiction (he was using as much as two quarts of laudanum a week) now began to take over his life: he separated from his wife Sarah in 1808, quarrelled with Wordsworth in 1810, lost part of his annuity in 1811, and put himself under the care of Dr. Daniel in 1814.

In 1809, Coleridge made his second attempt to become a newspaper publisher with the publication of the journal entitled The Friend. It was a weekly publication that, in Coleridge’s typically ambitious style, was written, edited, and published almost entirely single handedly. Given that Coleridge tended to be highly disorganized and had no head for business, the publication was probably doomed from the start. Coleridge financed the journal by selling over five hundred subscriptions, over two dozen of which were sold to members of Parliament, but in late 1809, publication was crippled by a financial crisis and Coleridge was obliged to approach "Conversation Sharp", Tom Poole and one or two other wealthy friends for an emergency loan in order to continue. The Friend was an eclectic publication that drew upon every corner of Coleridge’s remarkably diverse knowledge of law, philosophy, morals, politics, history, and literary criticism. Although it was often turgid, rambling, and inaccessible to most readers, it ran for 25 issues and was republished in book form a number of times. Years after its initial publication, The Friend became a highly influential work and its effect was felt on writers and philosophers from J.S. Mill to Emerson.

Between 1810 and 1820, this "giant among dwarfs", as he was often considered by his contemporaries, gave a series of lectures in London and Bristol – those on Shakespeare renewed interest in the playwright as a model for contemporary writers. Much of Coleridge's reputation as a literary critic is founded on the lectures that he undertook in the winter of 1810 – 11 which were sponsored by the Philosophical Institution and given at Scot's Corporation Hall off Fetter Lane, Fleet Street. These lectures were heralded in the prospectus as "A Course of Lectures on Shakespeare and Milton, in Illustration of the Principles of Poetry." Coleridge's ill-health, opium addiction problems, and somewhat unstable personality meant that all his lectures were plagued with problems of delays and a general irregularity of quality from one lecture to the next. Furthermore, Coleridge's mind was extremely dynamic and his personality was spasmodic. As a result of these factors, Coleridge often failed to prepare anything but the loosest set of notes for his lectures and regularly entered into extremely long digressions which his audiences found difficult to follow. However, it was the lecture on Hamlet given on 2 January 1812 that was considered the best and has influenced Hamlet studies ever since. Before Coleridge, Hamlet was often denigrated and belittled by critics from Voltaire to Dr. Johnson. Coleridge rescued Hamlet and his thoughts on the play are often still published as supplements to the text.

In August 1814, Coleridge was approached by Lord Byron's publisher, John Murray, about the possibility of translating Goethe's classic Faust (1808). Coleridge was regarded by many as the greatest living writer on the demonic and he accepted the commission, only to abandon work on it after six weeks. Until recently, scholars have accepted that Coleridge never returned to the project, despite Goethe's own belief in the 1820s that Coleridge had in fact completed a long translation of the work. In September 2007, Oxford University Press sparked a heated scholarly controversy by publishing an English translation of Goethe's work which purported to be Coleridge's long lost masterpiece (the text in question first appeared anonymously in 1821).

In 1817, Coleridge, with his addiction worsening, his spirits depressed, and his family alienated, took residence in the home of the physician James Gillman, first at South Grove and later at the nearby 3 The Grove, Highgate, London, England. He remained there for the rest of his life, and the house became a place of literary pilgrimage of writers including Carlyle and Emerson. In Gillman's home, he finished his major prose work, the Biographia Literaria (1817), a volume composed of 23 chapters of autobiographical notes and dissertations on various subjects, including some incisive literary theory and criticism. He composed much poetry here and had many inspirations — a few of them from opium overdose. Perhaps because he conceived such grand projects, he had difficulty carrying them through to completion, and he berated himself for his "indolence". It is unclear whether his growing use of opium (and the brandy in which it was dissolved) was a symptom or a cause of his growing depression. He published other writings while he was living at the Gillman home, notably Sibylline Leaves (1820), Aids to Reflection (1825), and Church and State (1826). He died in Highgate, London on 25 July 1834 as a result of heart failure compounded by an unknown lung disorder, possibly linked to his use of opium. Coleridge had spent 18 years under the roof of the Gillman family, who built an addition onto their home to accommodate the poet.

Carlyle described him at Highgate: "Coleridge sat on the brow of Highgate Hill, in those years, looking down on London and its smoke tumult, like a sage escaped from the inanity of life`s battle ... The practical intellects of the world did not much heed him, or carelessly reckoned him a metaphysical dreamer: but to the rising spirits of the young generation he had this dusky sublime character; and sat there as a kind of Magus, girt in mystery and enigma; his Dodona oak-grove (Mr. Gilman`s house at Highgate) whispering strange things, uncertain whether oracles or jargon."

Despite not enjoying the name recognition or popular acclaim that Wordsworth or Shelley have had, Coleridge is one of the most important figures in English poetry. His poems directly and deeply influenced all the major poets of the age. He was known by his contemporaries as a meticulous craftsman who was more rigorous in his careful reworking of his poems than any other poet, and Southey and Wordsworth were dependent on his professional advice. His influence on Wordsworth is particularly important because many critics have credited Coleridge with the very idea of "Conversational Poetry". The idea of utilizing common, everyday language to express profound poetic images and ideas for which Wordsworth became so famous may have originated almost entirely in Coleridge’s mind. It is difficult to imagine Wordsworth’s great poems, The Excursion or The Prelude, ever having been written without the direct influence of Coleridge’s originality. As important as Coleridge was to poetry as a poet, he was equally important to poetry as a critic. Coleridge's philosophy of poetry, which he developed over many years, has been deeply influential in the field of literary criticism. This influence can be seen in such critics as A.O. Lovejoy and I.A. Richards.

Coleridge is probably best known for his long poems, The Rime of the Ancient Mariner and Christabel. Even those who have never read the Rime have come under its influence: its words have given the English language the metaphor of an albatross around one's neck, the quotation of "water, water everywhere, nor any drop to drink" (almost always rendered as "but not a drop to drink"), and the phrase "a sadder and a wiser man" (again, usually rendered as "sadder but wiser man"). Christabel is known for its musical rhythm, language, and its Gothic tale.

Kubla Khan, or, A Vision in a Dream, A Fragment, although shorter, is also widely known. Both Kubla Khan and Christabel have an additional "romantic" aura because they were never finished. Stopford Brooke characterised both poems as having no rival due to their "exquisite metrical movement" and "imaginative phrasing."

The eight of Coleridge's poems listed above are now often discussed as a group entitled "Conversation poems". The term itself was coined in 1928 by George McLean Harper, who borrowed the subtitle of The Nightingale: A Conversation Poem (1798) to describe the seven other poems as well. The poems are considered by many critics to be among Coleridge's finest verses; thus Harold Bloom has written, "With Dejection, The Ancient Mariner, and Kubla Khan, Frost at Midnight shows Coleridge at his most impressive." They are also among his most influential poems, as discussed further below.

Harper himself considered that the eight poems represented a form of blank verse that is "...more fluent and easy than Milton's, or any that had been written since Milton". In 2006 Robert Koelzer wrote about another aspect of this apparent "easiness", noting that Conversation poems such as "... Coleridge's The Eolian Harp and The Nightingale maintain a middle register of speech, employing an idiomatic language that is capable of being construed as un-symbolic and un-musical: language that lets itself be taken as 'merely talk' rather than rapturous 'song'."

The last ten lines of "Frost at Midnight" were chosen by Harper as the "best example of the peculiar kind of blank verse Coleridge had evolved, as natural seeming as prose, but as exquisitely artistic as the most complicated sonnet." The speaker of the poem is addressing his infant son, asleep by his side:

Therefore all seasons shall be sweet to thee,

Whether the summer clothe the general earth

With greenness, or the redbreast sit and sing

Betwixt the tufts of snow on the bare branch

Of mossy apple-tree, while the nigh thatch

Smokes in the sun-thaw; whether the eave-drops fall

Heard only in the trances of the blast,

Or if the secret ministry of frost

Shall hang them up in silent icicles,

Quietly shining to the quiet Moon.

In 1965, M.H. Abrams wrote a broad description that applies to the Conversation poems: "The speaker begins with a description of the landscape; an aspect or change of aspect in the landscape evokes a varied by integral process of memory, thought, anticipation, and feeling which remains closely intervolved with the outer scene. In the course of this meditation the lyric speaker achieves an insight, faces up to a tragic loss, comes to a moral decision, or resolves an emotional problem. Often the poem rounds itself to end where it began, at the outer scene, but with an altered mood and deepened understanding which is the result of the intervening meditation." In fact, Abrams was describing both the Conversation poems and later poems influenced by them. Abrams' essay has been called a "touchstone of literary criticism". As Paul Magnuson described it in 2002, "Abrams credited Coleridge with originating what Abrams called the 'greater Romantic lyric', a genre that began with Coleridge's 'Conversation' poems, and included Wordsworth's Tintern Abbey, Shelley's Stanzas Written in Dejection and Keats's Ode to a Nightingale, and was a major influence on more modern lyrics by Matthew Arnold, Walt Whitman, Wallace Stevens, and W. H. Auden."