Princess Mary of Great Britain Princess Mary of Great Britain Princess Mary of Great Britain (5 March 1723 – 14 January 1772) was the second-youngest daughter of King George II of Great Britain and his wife Caroline of Ansbach, and Landgravine of Hesse-Kassel as the wife of Landgrave Frederick II. Princess Mary was born at Leicester House, Westminster, London. Her father was the Prince of Wales, later King George II. Her mother was Caroline of Ansbach, daughter of Johann Friedrich, Margrave of Brandenburg-Ansbach. Her father succeeded, as George II, on 11 June 1727, and she became "HRH The Princess Mary". Upon her death in 1737,
Caroline of Ansbach until her death in 1696. The orphaned Caroline and William Frederick returned to Ansbach to stay with their elder half-brother, Margrave George Frederick II. George Frederick was a youth with little interest in parenting a girl, and so Caroline soon moved to Lützenburg outside Berlin, where she entered into the care of her new guardians, Frederick, Elector of Brandenburg, and his wife, Sophia Charlotte, who had been a friend of Eleonore Erdmuthe. Frederick and Sophia Charlotte became king and queen of Prussia in 1701. The queen was the daughter of Dowager Electress Sophia of Hanover, and the sister of George,