Арнульф Каринтийский
Subsequently, at the Treaty of Mersen (870) the partitions were recast, to the detriment of Lotharingia. On 12 December 884, Charles the Fat (son of Louis the German) reunited most of the Carolingian Empire, aside from Burgundy. In late 887, his nephew Arnulf of Carinthia revolted and assumed the title as King of the East Franks. Charles retired and soon died on 13 January 888.