which opera had more acts? Le roi d'Ys or La favorite?
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.
Achille et Polyxène Achille et Polyxène ("Achilles and Polyxena") is a tragédie lyrique containing a prologue and five acts based on Virgil's "Aeneid" with a French libretto by Jean Galbert de Campistron. The opera's overture and first act were composed by Jean-Baptiste Lully, who died from a conducting injury before he could complete the score. The prologue and the remaining acts are the work of his pupil Pascal Collasse who finished the work, eight months after Lully's death on March 22, 1687. The opera was first performed on November 7, 1687, by the Paris Opera at the Théâtre du Palais-Royal in Paris.