Well, modern scholars are pretty much agreed that the Irish developed without profound influence from the Roman Empire, but most seem to agree that at least the Romans considered Hibernia to be a Roman Province and, if the more recent archaeological finds are accurately interpreted, the Romans were definitely there at least for awhile.
All the maps of the late Roman Empire include Hibernia.
But what do I know? I'm sure my professors, all with PHD's in history, are all stupid or, as CI seems to think, insane.