Duchy of Franconia
In 859, Charles was made Count of the Breisgau, an Alemannic march bordering southern Lotharingia. In 863 his rebellious eldest brother Carloman revolted against their father. The next year Louis the Younger followed Carloman in revolt and Charles joined him. Carloman received rule over the Duchy of Bavaria. In 865 the elder Louis was forced to divide his remaining lands among his heirs: Duchy of Saxony (with Duchy of Franconia and Duchy of Thuringia) went to Louis; Alemannia (Duchy of Swabia with Rhaetia) went to Charles. Lotharingia was to be divided between the younger two.