William Wordsworth (1770-1850) was a major English Romantic poet who, with Samuel Taylor Coleridge, helped to launch the Romantic Age in English literature with the 1798 joint publication Lyrical Ballads. Wordsworth's magnum opus is The Prelude, a semi-autobiographical poem of his early years which he revised and expanded a number of times. It was posthumously titled and published, prior to which it was generally known as the poem "to Coleridge". Wordsworth was Britain's Poet Laureate from 1843 until his death in 1850.