George Gordon Noel Byron Byron, 6th Baron  Later Life and Works
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