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
Sophia Jagiellon, Margravine of Brandenburg-Ansbach Sophia Jagiellon, Margravine of Brandenburg-Ansbach Sophia of Poland (, 6 May 1464 – 5 October 1512), was a princess, member of the Jagiellonian dynasty, great grand daughter of Emperor Sigismund and by marriage Margravine of Brandenburg-Ansbach and Brandenburg-Kulmbach. Born in Kraków, she was the second daughter of Grand Duke of Lithuania and King Casimir IV of Poland and his wife Archduchess Elisabeth of Austria, daughter of the German king Albrecht. She was named after her paternal grandmother, Sophia of Halshany, Queen of Poland. Sophia was baptised by John Gruszczynski, Bishop of Krakow. There is no information available concerning Sophia's upbringing