John Keats was an English Romantic poet, born on October 31, 1795, in London. Despite dying at the young age of 25, he left a significant impact on English literature with his rich imagery and sensual style. His most famous works, including "Ode to a Nightingale" and "To Autumn," explore themes of beauty, transience, and the interplay between imagination and reality. Keats's poetry was initially met with mixed reviews, but he is now celebrated as one of the greatest poets of the Romantic era.