Ivanhoé is an 1826 pastiche opera in three acts with music by Gioachino Rossini, the  music was adapted, with the composer's permission, by the music-publisher Antonio Pacini from Rossini's operas, namely La gazza ladra, is a "melodramma" or opera semiseria in two acts by Gioachino Rossini, with a libretto by who?
La gazza ladra La gazza ladra (] , The Thieving Magpie) is a "melodramma" or opera semiseria in two acts by Gioachino Rossini, with a libretto by Giovanni Gherardini based on "La pie voleuse" by Théodore Baudouin d'Aubigny and Louis-Charles Caigniez.
La lettera anonima La lettera anonima ("The anonymous letter") is a farce in one act composed by Gaetano Donizetti in 1822 to a libretto by Giulio Genoino, a former monk and the official censor of the Kingdom of the Two Sicilies. Genoino based his libretto on his own farce which, in turn, had been based on "Mélite, ou Les fausses lettres " by Pierre Corneille in 1630.