Mary, Princess Royal, Princess of Orange and Countess of Nassau (4 November 1631 – 24 December 1660) was the eldest daughter of King Charles I of England, Scotland, and Ireland and his queen, Henrietta Maria. She was the wife of William II, Prince of Orange and Count of Nassau (27 May 1626–6 November 1650) and the mother of King William III of England and Ireland, II of Scotland (14 November 1650–8 May 1702). Mary Stuart or Mary of Orange, as she was also known, was the first daughter of a British Sovereign to hold the title Princess Royal.