No, the Romans were civilization itself. If you don't believe that just find a Roman and ask. Oh wait, there aren't any Romans anymore. It doesn't matter, the center of civilization was transferred to the Celts who aren't barbarian anymore, depending on who you ask these days.
That's a good answer, if you rely on Roman history about itself. {ggg}.
We know the Celtic population about 600 BC was over 6 MILLION people, and ~10% of the global population. (The global Celtic population today is near 1 BILLION out of a global 6 BILLION so is still ~10%+).
Do you have any commensurate Roman populations and Global percentages with which to make a meaningful comparison?