Question

Which invaders of the Roman Empire came from the farthest eastern point?

Answer 1

The easternmost country that invaded the Roman Empire were the Persians, located somewhere in modern day Iran area.

Answer 2

I believe the answer is: Persians

The conflict that arise between the Persians and the Roman lasted around 680 years, and considered to be the longest conflict known to human history. These wars proven to be catastrophic for both empires, which lead to the weakening that cause their empire to fell.