Part of Tutto Verdi series - Stiffelio (2012) Parma. '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'hommesâ?, 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.