William Frederick, Margrave of Brandenburg-Ansbach William Frederick, Margrave of Brandenburg-Ansbach William Frederick, Margrave of Brandenburg-Ansbach (8 January 1686 – 7 January 1723), was Margrave of the Principality of Brandenburg-Ansbach from 1703 until his death in 1723. He was the younger brother of Caroline of Ansbach and thus brother-in-law of George II of Great Britain. William Frederick was born in Ansbach in 1686 to John Frederick, Margrave of Brandenburg-Ansbach, and his second wife, Eleonore Erdmuthe of Saxe-Eisenach. His two surviving half-brothers, Margraves Christian Albert and George Frederick II, both died unmarried and without legitimate issue. He married his first cousin, Christiane Charlotte of Württemberg-Winnental. He died
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.