Princess of Orange and Countess of Nassau by marriage to Prince William II. She was the eldest daughter of King Charles I of England, Scotland, and Ireland and his wife, Henrietta Maria of France. Her only child, William succeeded her husband as Prince of Orange-Nassau and later reigned as King of England, Ireland and Scotland. Mary was the first daughter of a British sovereign to hold the title Princess Royal. She was co-regent for her son during his minority as Sovereign Prince of Orange from 1651 to 1660.
