William Frederick, Margrave of Brandenburg-Ansbach in Unterreichenbach and was succeeded by his son Charles William Frederick, called "The Wild Margrave". 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
Caroline of Ansbach leading to unpopularity, and in late 1736 he made plans to return, but his ship was caught in poor weather, and it was rumoured that he had been lost at sea. Caroline was devastated, and disgusted by the insensitivity of her son, who hosted a grand dinner while the gale was blowing. During her regency, the Prince of Wales attempted to start a number of quarrels with his mother, whom he saw as a useful proxy to irritate the King. George eventually returned in January 1737. Frederick applied to Parliament unsuccessfully for an increased financial allowance that had hitherto been