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.
La Lodoiska La Lodoiska is an opera in three acts by Simon Mayr to an Italian libretto by Francesco Gonella De Ferrari. It was Mayr's second opera and premiered at La Fenice in Venice on 26 January 1796.