4‐act opera by Verdi to lib. by Piave based on Spanish drama Don Alvaro (1835) by the Duke of Rivas with scene interpolated from Schiller's Wallensteins Lager (1799) trans. by A. Maffei. Comp. 1861–2 for Imperial Th., St Petersburg, where f.p. was given in 1862. Prod. Rome (as Don Alvaro) 1863, NY 1865, London 1867. In 1868–9 Verdi made extensive revs. for 1869 Milan prod. and added ov. Lib. rev. by Ghislanzoni.