Treaty of Meerssen
Charles the Bald was also crowned King of Lotharingia after the death of Lothair II in 869, but in the Treaty of Meerssen (870) was forced to cede much of Lotharingia to his brothers, retaining the Rhone and Meuse basins (including Verdun, Vienne and Besançon) but leaving the Rhineland with Aachen, Metz, and Trier in East Francia.