Question: Which four act opera based on "El trovador" was written by the same composer as "Les vepres siciliennes?"
Sentence (from "Il trovatore"): Il trovatore (] ; Italian for "The Troubadour") is an opera in four acts by Giuseppe Verdi to an Italian libretto largely written by Salvadore Cammarano, based on the play "El trovador" (1836) by Antonio García Gutiérrez.
Relevant evidence: Yes