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 had a successful and loving marriage, though he continued to keep mistresses, as was customary for the time. Caroline was well aware of his infidelities, as they were well known and he told her about them. His two best-known mistresses were Henrietta Howard, later Countess of Suffolk, and, from 1735, Amalie von Wallmoden, Countess of Yarmouth. Howard was one of Caroline's Women of the Bedchamber and became Mistress of the Robes when her husband inherited a peerage in 1731; she retired in 1734. In contrast with her mother-in-law and husband, Caroline was known for her marital fidelity; she never made