4‐act opera by Donizetti to lib. by Royer, Vaëz, and Scribe. Prod. Paris 1840, New Orleans and London 1843, NY Met 1895 (It. vers.). Also perf. in Italian under titles Leonora di Guzman (Padua, 1842) and Elda (Milan, 1843), and in Ger. as Richard und Mathilda (Cassel, 1841), as well as La Favorita (It.). It is a rev. of L'Ange de Nisida, in 3 acts by same librettists, comp. 1839 and unperformed.