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 roi de Lahore Le roi de Lahore ("The king of Lahore") is an opera in five acts by Jules Massenet to a French libretto by Louis Gallet. It was first performed at the Palais Garnier in Paris on 27 April 1877 in costumes designed by Eugène Lacoste and settings designed by Jean Émile Daran (Act I, scene 1), Auguste-Alfred Rubé and Philippe Chaperon (Act I, scene 2; Act V), Louis Chéret (Act II), Jean-Baptiste Lavastre (Act III), Antoine Lavastre and Eugène Louis Carpezat (Act IV).