Question: Which four act opera based on "El trovador" was written by the same composer as "Les vepres siciliennes?"
Sentence (from "Les vêpres siciliennes"): "Les vêpres" followed immediately after Verdi's three great mid-career masterpieces, "Rigoletto", "Il trovatore" and "La traviata" of 1850 to 1853 and was first performed at the Paris Opéra on 13 June 1855.
Relevant evidence: No