Do both Simon Boccanegra and Le roi d'Ys have the same number of acts?
Le roi d'Ys Le roi d'Ys ("The King of Ys") is an opera in three acts and five tableaux by the French composer Édouard Lalo, to a libretto by Édouard Blau, based on the old Breton legend of the drowned city of Ys. That city was, according to the legend, the capital of the kingdom of Cornouaille.
Le Diable amoureux (ballet) Le Diable amoureux (also known as Satanella or Love and Hell) is a "ballet pantomime" in three acts and eight scenes, originally choreographed by Joseph Mazilier to the music of Napoléon Henri Reber and François Benoist. The libretto by Jules-Henri Vernoy de Saint-Georges is based on Jacques Cazotte's 1772 occult romance "The Devil in Love". The work was first presented by the Ballet du Théâtre de l'Académie Royale de Musique in Paris on 23 September 1840, with Pauline Leroux (as Uriel), Mazilier (as Alvaro, for ballet his name is Frederic), and Louise Fitz-James (as Lilia).