Don Carlos is an 1867 five-act grand opera composed by Giuseppe Verdi to a French-language libretto by Joseph Méry and Camille du Locle, based on the 1787 play Don Karlos, Infant von Spanien by Friedrich Schiller and several incidents from Eugène Cormon's 1846 play Philippe II, Roi d'Espagne. The opera is most often performed in Italian translation, usually under the title Don Carlo.