What cousin of Herman I, Duke of Swabia also had a chance to rule the Duchy of Franconia?
Herman I, Duke of Swabia Herman I (died 10 December 949) was the first Conradine Duke of Swabia (from 926), the son of Gebhard, Duke of Lorraine, and a cousin of King Conrad I of Germany.
Albert Frederick, Duke of Prussia Albert Frederick (German: "Albrecht Friedrich" , Polish: "Albrecht Fryderyk" ; 7 May 1553, in Königsberg – 28 August 1618, in Fischhausen, Rybaki) was Duke of Prussia from 1568 until his death. He was a son of Albert of Prussia and Anna Marie of Brunswick-Lüneburg. He was the second and last Prussian duke of the Ansbach branch of the Hohenzollern family.