Germania was home to a very large number of Germanic and a few Celtic tribes. The northern provinces of Germania were called "Germania Inferior". Some of the tribes known to live here were the Menapii, Batavi, Condrusi, Atuataci and Eburones. Close to the Roman fortifications on the east side of the Rhine lived the Frisii, Chauci, Istavones, Sicambri, Marsii, Cattii, and Ubii tribes. The Ubii were friendly with the Romans and provided cavalry as well as guarded the border for the Romans.