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 denied him by the King, and public disagreement over the money drove a further wedge between parents and son. On the advice of Walpole, Frederick's allowance was raised in an attempt to mitigate further conflict, but by less than he had asked. In June 1737, Frederick informed his parents that Augusta was pregnant, and due to give birth in October. In fact, Augusta's due date was earlier and a peculiar episode followed in July in which the prince, on discovering that his wife had gone into labour, sneaked her out of Hampton Court Palace in the middle of the night,