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,
Principality of Ansbach reunited under Frederick VI, who had become Elector Frederick I of Brandenburg in 1415. Upon Frederick I's death on 21 September 1440, his territories were divided between his sons; John received the principality of Bayreuth (Brandenburg-Kulmbach), Frederick received Brandenburg, and Albert received Ansbach. Thereafter Ansbach was held by cadet branches of the House of Hohenzollern, and its rulers were commonly called Margraves of Brandenburg-Ansbach. On 2 December 1791, the reigning Prince and Margrave of Ansbach, Charles Alexander, who had also succeeded to Bayreuth, sold the sovereignty of his principalities to King Frederick William II of Prussia. The Margrave was middle-aged