Keats died in Italy of tuberculosis and is buried in Rome.   A year later, Shelley died in a boating accident off the coast of Italy.   His body was lost for several days and when found unrecognizable, Shelley was identified by the book in his jacket pocket . . . . Lamia by John Keats.

This poem . . . To Autumn . . . was one of the many Keats had written in the year of 1819.  When published the poems were not well received, or appreciated, until much later in the Victorian Era.