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 Sophia Charlotte, who became her good friend and whose views influenced Caroline all her life. As a young woman, Caroline was much sought-after as a bride. After rejecting the suit of the nominal King of Spain, Archduke Charles of Austria, she married George Augustus, the third-in-line to the British throne and heir apparent to the Electorate of Hanover. They had eight children, seven of whom grew to adulthood. Caroline moved permanently to Britain in 1714 when her husband became Prince of Wales. As Princess of Wales, she joined her husband in rallying political opposition to his father King George I.