Arnulf of Carinthia
At first, King Rudolph I tried to re-unite the Lotharingian realm of late Lothair II, but strong opposition by the East Frankish king Arnulf of Carinthia forced him to focus on his territory of Transjurania and the western Franche-Comté estates. Arnulf acknowledged Rudolph's rule in Upper Burgundy, but finally declared his illegitimate son Zwentibold King of Lotharingia in 895.