1 4‐act opera by Donizetti, to lib. by Scribe, written for Paris 1839 but not prod. Score recovered at Bergamo 1875, completed by Salvi, and prod. as Il duca d'Alba, Rome 1882. Scribe altered lib. and re‐sold it to Verdi in 1853 as Les Vêpres siciliennes, Verdi only discovering 30 years later that it had been used by Donizetti.
2 Opera, Il Duca d'Alba, by Pacini to lib. by Piave, 1842.