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 timbre d'argent Le timbre d'argent ("The Silver Bell") is an opéra fantastique in four acts by composer Camille Saint-Saëns to a French libretto by Jules Barbier and Michel Carré. Although completed in 1865, the opera did not receive its premiere performance until 23 February 1877, when it was presented by Albert Vizentini's Théâtre National Lyrique at the Théâtre de la Gaîté in Paris. It includes the well-known aria "Le bonheur est chose légère."