メルセン条約
Later, "Hasbania" was mentioned in the division of territories between Charles the Bald and Louis the German in 870 in the Treaty of Meerssen, which specifically mentions that it had four counties at that time. Its exact boundaries are unclear but it may have stretched as far west as Leuven and the River Dyle. Judging from the ancient catholic Archdeaconry of Hesbaye, it may also have stretched to the east of the Meuse.