Which opera has more parts including acts and tableaux, Le roi d'Ys or Stiffelio?
Stiffelio Stiffelio is an opera in three acts by Giuseppe Verdi, from an Italian libretto by Francesco Maria Piave. The origin of this was the novel “Le pasteur d’hommes”, by Émile Souvestre, which was published in 1838. This was adapted into the French play "Le pasteur, ou L'évangile et le foyer" by Émile Souvestre and Eugène Bourgeois. That was in turn translated into Italian by Gaetano Vestri as "Stifellius"; this formed the basis of Piave's libretto.
Callirhoé Callirhoé is an opera by the French composer André Cardinal Destouches. It takes the form of a "tragédie en musique" in a prologue and five acts. The libretto, by Pierre-Charles Roy, is based on a story from "The Description of Greece" by Pausanias (see Coresus). The opera was first performed on December 27, 1712, by the Académie royale de musique at the Théâtre du Palais-Royal in Paris. Destouches reworked the score for a revival on 22 October, 1743. This version ends abruptly with the death of Corésus.