Percy Bysshe Shelley was a British writer who is considered as one of the major English Romantic poets. A radical in his poetry as well as in his political and social views, Shelley did not achieve fame during his lifetime, but recognition of his achievements in poetry grew steadily following his death, and he became an important influence on subsequent generations of poets, including Robert Browning, Algernon Charles Swinburne, Thomas Hardy, and W. B. Yeats. American literary critic Harold Bloom describes him as "a superb craftsman, a lyric poet without rival, and surely one of the most advanced sceptical intellects ever to write a poem."

Romanticism was an artistic, literary, and intellectual movement that originated in Europe toward the end of the 18th century. Scholars regard the publishing of William Wordsworth's and Samuel Coleridge's Lyrical Ballads in 1798 as probably the beginning of the movement in England, and the crowning of Queen Victoria in 1837 as its end. Romanticism arrived in other parts of the English-speaking world later; in the United States, about 1820.