Herzogtum Franken
The emergence of the Duchy of Franconia from "a position of leadership amongst the Frankish nation in the eastern kingdom" in the late 9th century is poorly documented. The first clear duke was Conrad the Elder, who was also Duke of Thuringia. In 906 he died and was succeeded as duke by his son, Conrad the Younger, who was elected King of Germany in 911, without relinquishing his ducal office. Although it seems likely that Conrad's brother, Eberhard, held the duchy of Franconia during the reign of Henry I (919–36), the first reference to him with the title "dux Francorum" comes from the early in the reign of Otto I (936–73).