Les vêpres siciliennes (The Sicilian Vespers, but today better-known in its post-1861 Italian version as I vespri siciliani) is an opéra in five acts by the Italian romantic composer Giuseppe Verdi set to a French libretto by Charles Duveyrier and Eugène Scribe from their work Le duc d'Albe, which was written in 1838 and offered to Halevy and Donizetti before Verdi agreed to set it to music in 1854.
The story is based on a historical event, the Sicilian Vespers of 1282, using material drawn from the medieval Sicilian tract Lu rebellamentu di Sichilia.