Pectinarius Antonius says:

To the Romans, ANYONE who lived outside the frontiers of the empire was termed a 'barbarian', which strictly means simply a 'foreigner'.

Pectinarius, you are wagging a semantic argument. Technically, barbarus means savage, uncouth, opposed, first to Greece, then Rome, but the term came to be associated with societies that were “uncivilized.”

The Parthians, as well as Persians, were considered foreigners. Thus, taking the literal meaning, they were both, “barbarians,”…they were also considered by Rome to be civilized. They shared a common concept of culture and refinery that the tribes did not thus were given a certain amount of respect.

As far as the Jewish people and the Iceni, neither had the concept of empire, the measure of a great civilization.