John Keats was an English poet born on October 31, 1795, in London. He is best known for his contributions to the Romantic movement, which emphasized emotion and nature. Keats's poetry often explores themes of beauty, love, and mortality. Some of his most famous works include "Ode to a Nightingale" and "Ode on a Grecian Urn." Despite his short life, as he died at the age of 25 on February 23, 1821, Keats left a lasting impact on literature. His work has inspired countless writers and poets, and he is celebrated for his vivid imagery and lyrical style, making him a key figure in Romantic literature.