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So around the time of classical antiquity mentioned by Herodotus and others a fierce Iranian people known as the scythians roamed the steppes of what would become Eastern Europe, Russia and north Central Asia.
They were not United but what if they were? What if you had an equivalent of the Huns or at least the Magyars come down from the steppes say anywhere from 300 BC to 100 AD?
How long could they have lasted how would they have affected the Roman Empire? And so forth and so on?