The Adrian renegade, a Venetian by extraction, who forswore the Christian faith to become a commander in the Turkish army. He led the host to the siege of Corinth, while that country was under the dominion of the Doge. He loved Francesca, daughter of Minotti, governor of Corinth, but she died of a broken heart because he deserted his country and was an apostate. The renegade was shot in the siege. —Byron: Siege of Corinth.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894