メルセン条約
As Lothair II had died without heirs, his territory was divided by the 870 Treaty of Meerssen between East and West Francia and finally came under East Frankish rule as a whole by the 880 Treaty of Ribemont. After the East Frankish Carolingians became extinct with the death of Louis the Child in 911, Lotharingia once again attached itself to West Francia, but was conquered by the German king Henry the Fowler in 925. Stuck in the conflict with his rival Hugh the Great, in 942 King Louis IV of France renounced all claims to Lotharingia.