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.
Welf I, Duke of Bavaria Welf I (died 6 November 1101, Paphos, Cyprus) was Duke of Bavaria from 1070 to 1077 and from 1096 to his death. He was the first member of the Welf branch of the House of Este. In the genealogy of the Elder House of Welf he is counted as Welf IV.