Roberto Devereux: A Lyric Tragedy, In Three Acts (1849) is an opera composed by the Italian composer Gaetano Donizetti. The libretto was written by Salvadore Cammarano and is based on the historical figure of Robert Devereux, 2nd Earl of Essex, who was a favorite of Queen Elizabeth I of England. The story revolves around the love triangle between Roberto Devereux, Queen Elizabeth I, and Sara, Duchess of Nottingham. Roberto Devereux is accused of treason...