​DON JUAN (whän) the hero of a Spanish legend which seems to have had some historical basis in the history of a member of the noble family of Tenorio at Seville. The legend has furnished the subject for many dramas and operas. The most famous of the latter is Mozart's "Don Giovanni." Among the former are "Don Juan ou Le Festin de Pierre," by Molière and "The Libertine," by Shadwell. The "Don Juan" of Byron bears no relation to the old story.