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 mort d'Abel La mort d'Abel ("The Death of Abel") is an opera by the French composer Rodolphe Kreutzer. The libretto, by François-Benoît Hoffman, deals with the Biblical story of Cain and Abel. It was first performed in a three-act version at the Salle Montansier by the Académie Impériale de Musique (the Paris Opéra) on 23 March 1810 under the title "Abel". A revival at the Salle Le Peletier in 1823, in which the second act was cut, impressed the young Hector Berlioz.