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 had a successful and loving marriage, though he continued to keep mistresses, as was customary for the time. Caroline was well aware of his infidelities, as they were well known and he told her about them. His two best-known mistresses were Henrietta Howard, later Countess of Suffolk, and, from 1735, Amalie von Wallmoden, Countess of Yarmouth. Howard was one of Caroline's Women of the Bedchamber and became Mistress of the Robes when her husband inherited a peerage in 1731; she retired in 1734. In contrast with her mother-in-law and husband, Caroline was known for her marital fidelity; she never made