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.
Cora (opera) Cora is an opera in four acts by the French composer Étienne Méhul. The libretto, by Valadier, is based on the novel "Les Incas" by Jean-François Marmontel. It was the first opera Méhul wrote but the second to be performed, receiving its premiere at the Académie Royale de Musique (the Paris Opéra) on 15 February 1791. "Cora" was not a success and there were only four more performances (18, 20, 25 February and 4 March).