Which opera has more parts including acts and tableaux, Le roi d'Ys or Stiffelio?
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.
Poro (opera) Poro, re dell'Indie ("Porus, King of the Pakistani region", HWV 28) is an opera seria in three acts by George Frideric Handel. The Italian-language libretto was adapted from "Alessandro nell'Indie" by Metastasio, and based on Alexander the Great's encounter with King Porus in 326 BC. The libretto had already been set to music by Leonardo Vinci in 1729 and by Antonio Vivaldi among others and was used as the text for more than sixty operas throughout the 18th century.