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 she believed her place was with her husband. She and her husband moved into Leicester House, while their children remained in the care of the King. Caroline fell sick with worry, and fainted during a secret visit to her children made without the King's approval. By January, the King had relented and allowed Caroline unrestricted access. In February, Prince George William fell ill, and the King allowed both George Augustus and Caroline to see him at Kensington Palace without any conditions. When the baby died, a post-mortem was conducted to prove that the cause of death was disease (a polyp