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 dramatic play Don Karlos, Infant von Spanien (Don Carlos, Infante of Spain) by Friedrich Schiller. In addition, several incidents, of which the Forest of Fontainebleau scene and auto-da-fé were the most substantial, were borrowed from Eugène Cormon's... Wikipedia