Don Carlos is an 1867 five-act grand opéra composed by Giuseppe Verdi to a French-language libretto by Joseph Méry and Camille du Locle. Its basis is Friedrich Schiller's play Don Karlos, Infant von Spanien, but it borrows from Eugène Cormon's play Philippe II, Roi d'Espagne, as well. It is often performed in Italian translation, as Don Carlo. . The plot recounts conflicts in the life of Carlos, Prince of Asturias (1545–1568).
https://en.wikipedia.org/wiki/Don_Carlos