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.
Cora (opera) Cora is an opera in four acts by the French composer Étienne Méhul. The libretto, by Valadier, is based on the novel "Les Incas" by Jean-François Marmontel. It was the first opera Méhul wrote but the second to be performed, receiving its premiere at the Académie Royale de Musique (the Paris Opéra) on 15 February 1791. "Cora" was not a success and there were only four more performances (18, 20, 25 February and 4 March).