Il furioso all'isola di San Domingo (The Madman on the Island of San Domingo) is a "romantic melodramma" in two acts by the composer Gaetano Donizetti. Jacopo Ferretti, who since 1821 had written five libretti for Donizetti and two for Rossini (including La Cenerentola), had proposed the unusual subject and he was contracted to write the Italian libretto based on a five-act play of the same title by an unknown author in 1820, which "had been given in the same theatre [...] and which Donizetti had immediately loved". However, as has been noted by Charles Osborne, the "ultimate derivation of both play and libretto is an episode in part 1 of Don Quixote by Miguel de Cervantes's published in 1605" which is the story of Cardenio and Lucinda.