• Philip II., King of Spain.
• Don Carlos, his Son.
• Don John of Austria.
• Marquis of Posa, the Prince's Confidant.
• Ruy-Gomez.
• Officer of the Guards.
• Queen of Spain.
• Duchess of Eboli, Wife of Ruy-Gomez.
• Henrietta.
• Garcia.

SCENE—The Court of Spain.