How many acts are in both Le roi d'Ys and King Roger?
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. King Roger:  46) is an opera in three acts by Karol Szymanowski to a Polish libretto by the composer himself and Jarosław Iwaszkiewicz, the composer's cousin.
three