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 she believed her place was with her husband. She and her husband moved into Leicester House, while their children remained in the care of the King. Caroline fell sick with worry, and fainted during a secret visit to her children made without the King's approval. By January, the King had relented and allowed Caroline unrestricted access. In February, Prince George William fell ill, and the King allowed both George Augustus and Caroline to see him at Kensington Palace without any conditions. When the baby died, a post-mortem was conducted to prove that the cause of death was disease (a polyp