Celt - No such thing !!!

[M. Demetrius]

So you would refer to a 4th c. Roman citizens as a Celt when he speaks Gallic?

Only if a 4th c. Roman citizen speaking Greek would be referred to as a Greek. I think I know what you mean. I wonder how much difference was, in a "racist" sort of way made between Romans who lived for generations in Italy and those who had been made Romans by virtue of their countries having been annexed into the Empire.

There is a conversation in Acts between Paul (born Roman) and a centurion (who had purchased his citizenship) that lends credence to there being a distinction. But Paul didn't call himself a "Tarsian", he called himself a Roman, speaking of nationality. I'm sure he called himself other things depending on to whom he was speaking.