The problem I have with a direct Roman reference is that they were well known for integrating anything and anyone that could be useful to them so the xenophobic bit from Trinia seems out of place, then again I'm sure at least some of the would be Emperors have tried the "true Romans Vs parasites" approach.

It's just that Trinia and Garm's messages are very similar to the ones we hear and have heard for a few years now.