“ MERSEN (Meerssen) , TREATY OF, a treaty concluded on the 8th of August 870 at Mersen, in Holland, between Charles the Bald and his half-brother, Louis the German, by which the kingdom of their nephew Lothair II. (d. 869) was divided between them. Charles received a portion of the kingdom of Lothair afterwards called Lorraine, extending from the mouths of the Rhine to Toul, together with the town of Besançon, the Lyonnais, the Viennais, the Vivarais, and the Uzège, i.e. the lands acquired by Lothair II. in 863 at the, death of his brother Charles of Provence ”