1772-1834. English poet, one of the founders of the Romantic movement. A friend of Southey and Wordsworth, he collaborated with the latter on Lyrical Ballads 1798. His poems include `The Ancient Mariner', `Christabel', and `Kubla Khan'; critical works include Biographia Literaria 1817. While at Cambridge, Coleridge was driven by debt to enlist in the Dragoons, and then in 1795, as part of an abortive plan to found a Communist colony in the USA with Robert Southey, married Sarah Fricker, from whom he afterwards separated. He became addicted to opium and from 1816 lived at Highgate, London, under medical care. As a philosopher, he argued inferentially that even in registering sense- perceptions the mind was performing acts of creative imagination, rather than being a passive arena in which ideas interact mechanistically. As a critic, he used psychological insight to brilliant effect in his Biographia Literaria and Shakespearean criticism.