Which opera has more acts, Le prophète or La scala di seta?
Le prophète Le prophète ("The Prophet") is a grand opera in five acts by Giacomo Meyerbeer. The French-language libretto was by Eugène Scribe and Émile Deschamps, after passages from the "Essay on the Manners and Spirit of Nations" by Voltaire. The plot is based on the life of John of Leiden, Anabaptist leader and self-proclaimed "King of Münster" in the 16th century.
Jone (opera) Jone, ossia L'ultimo giorno di Pompei is an opera in four acts by Errico Petrella. The Italian-language libretto was by Giovanni Peruzzini, after Edward Bulwer-Lytton's famous novel "The Last Days of Pompeii".