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.
La Périchole La Périchole (] ) is an opéra bouffe in three acts by Jacques Offenbach. Henri Meilhac and Ludovic Halévy wrote the French-language libretto based on the 1829 one act play "Le carrosse du Saint-Sacrement" by Prosper Mérimée, which was revived on 13 March 1850 at the Théâtre-Français. Offenbach was probably aware of this production, as he conducted the orchestra of the Comédie-Française from around this time. Another theatrical creation that pre-dates Offenbach's opéra bouffe and may have influenced the piece is a farce by Desforges and Théaulon given on 21 October 1835 at the Théâtre du Palais-Royal.