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Answer:
The people who defined what a Barbarian was in the Ancient Greek and Roman world were the Roman and Greek intellectuals, who each considered their own culture to be most superior culture in the world at the time, and who looked down on other cultures.
Explanation:
People like Pythagoras, Plato, Aristotle (Greeks), or Seneca, Cicero, and Tacitus (Romans) deemed to be "Barbarians" all those peoples who did not belong to either Greek or Roman civilization, and they wrote books that supported these views. The common people simply took these views at face value and did not reflect too much on them, since most people at the time were illiterate in first place.