Romans in Gaul - How to call them?

[Centurio Nixalsverdrus]

I think the Franks were Germans.

Good advice here. What about Imperivm Galloromanorvm? If I'm not mistaken, this means Empire (or better "Rule") of the Galloromans / the Romans in Gaul.

Imperivm Galliarvm seems good to me too, but what buggers me a bit there is that Gaul is not so thoroughly romanized yet as it was some 4 1/2 centuries later. Most of the cities there so far still have the Celtic city model / core building. The Romans have been battling the Aedui for decades, but once they were gone, and I gave the Arverni many territories in Northern Italy, this acted like a catalysator and made the Romans go on a blood rush through Gaul in no more than a few years while loosing territory to the Carthaginians in Southern Italy. It was really scary, there could nothing be done for the poor Arverni. They really had a nice empire in Gaul, even occupying eastern Hispania for decades.