In Apr., 1816, by then a social outcast, Byron left England, never to return. He passed some time with Shelley in Switzerland, writing Canto III of Childe Harold (1816) and The Prisoner of Chillon (1816). With the party was Shelley's sister-in-law, Claire Clairmont, who had practically forced Byron into a liaison before he left England, and who, in Jan., 1817, bore him a daughter, Allegra.
Settling in Venice (1817), Byron led for a time a life of dissipation, but produced Canto IV of Childe Harold (1818), Beppo (1818), and Mazeppa (1819) and began Don Juan. In 1819 he formed a liaison with the Countess Teresa Guiccioli, who remained his acknowledged mistress for the rest of his life. Byron was induced to interest himself in the cause of Greek independence from the Turks and sailed for Missolonghi, where he arrived in 1824. He worked unsparingly with Prince Alexander Mavrocordatos to unify the divergent Greek forces, but caught a fever and died the same year.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.