http://www.bbc.co.uk/arts/romantics/intro.shtml Please see this link, The best known Romantic poets were William Blake, William Wordsworth, Samuel T. Coleridge, Lord Byron, Percy Shelley, and John Keats. Their poetry was dependent on various features peculiar to their time: a reaction against previous literary styles, arguments with eighteenth century and earlier philosophers, the decline in formal Anglican worship and the rise of dissenting religious sects, and the rapid and unprecedented industrialization of Britain and consequent changes in its countryside. http://www.poetseers.org/the-romantics/

Most likely it was a period in time when a lot of English poets made poetry with a romantic theme to it.