Treaty of Meerssen
In the Carolingian and Ottonian periods in the early Middle Ages, Batavia, called "Batua" by the Franks, was an example of a Frankish "gau" that was based on much older Roman "pagi". Several counts are recorded as having their counties there, and it is mentioned in the treaties such as the Treaty of Meerssen, that divided up Europe among the different Frankish kingdoms.