The historic Low Countries made up much of Frisia, home to the Frisii, and the Roman provinces of Gallia Belgica and Germania Inferior, home to the Belgae and Germanic peoples like the Batavi. Throughout the centuries, the names of these ancestors have been in use as a reference to the Low Countries, in an attempt to define a collective identity. But it was in the fourth and fifth centuries that a Frankish confederation of Germanic tribes significantly made a lasting change by entering the Roman provinces and starting to build the Carolingian Empire, of which the Low Countries formed a core part.