メルセン条約
After the death of Charlemagne, the Frankish dominions were again split between kings. While the Austrasian lands remained a separate "Middle Kingdom", sometimes now referred to as Lotharingia, in the treaties of Verdun (843), and Prüm (855), in the 870 Treaty of Meerssen, signed in South Limburg itself, Lotharingia was divided. The river Meuse became the border between the Western- and Eastern Frankish kingdoms, placing most of the current Dutch province of Limburg on the western boundary of the Eastern Frankish kingdom, with Belgian Limburg in the Western Kingdom. In the Treaty of Ribemont of 888, the Eastern Kingdom was granted control of the whole of Lotharingia, including all of the modern Netherlands and Luxembourg, and most of modern Belgium.