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.
Stephen II, Duke of Bavaria Duke Stephen II of Bavaria (1319 – 13 May 1375, Landshut) (German: "Stephan II. mit der Hafte, Herzog von Bayern"), after 1347 Duke of Bavaria. He was the second son of Emperor Louis IV the Bavarian by his first wife Beatrix of Świdnica and a member of the Wittelsbach dynasty.