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 ruler of one of the smallest German states; he died of smallpox at the age of 32, when Caroline was three years old. Caroline and her only full sibling, her younger brother Margrave William Frederick, left Ansbach with their mother, who returned to her native Eisenach. In 1692, Caroline's widowed mother was pushed into an unhappy marriage with the Elector of Saxony, and she and her two children moved to the Saxon court at Dresden. Eleonore Erdmuthe was widowed again two years later, after her unfaithful husband contracted smallpox from his mistress. Eleonore remained in Saxony for another two years,