John Keats was an English Romantic poet who wrote many famous poems, including 'Lamia, ' 'ODE on a Grecian Urn, ' and 'The Eve of St. Agnes.' 'Lamia' is a five-letter poem about a serpent-like creature, while 'ODE on a Grecian Urn' is a three-letter poem about a piece of ancient Greek pottery. Finally, 'The Eve of St. Agnes' is a fifteen-letter poem about a young woman's dream. All three of these poems are considered to be some of Keats' most famous works.