what major empire bordered ancient rome to the east

The major empire that bordered ancient Rome to the east was the Parthian Empire , and later its successor, the Sasanian (Sassanid) Empire.

Quick Scoop

When people ask “what major empire bordered ancient Rome to the east,” they are usually thinking of Rome at its height in the first few centuries CE. On that eastern frontier, Rome’s main long-term rival was Persia in two successive forms: first Parthia, then the Sasanian dynasty.

Who was on Rome’s eastern border?

• Parthian Empire (c. 247 BCE – 224 CE)
  • A powerful Iranian empire controlling much of modern Iran, Iraq, Armenia, and parts of the Caucasus.

* Rome and Parthia fought repeated wars over Armenia and Mesopotamia, with neither side able to fully dominate the other.

• Sasanian Empire (c. 224 – 651 CE)
  • Rose after overthrowing the Parthians around 224–226 CE.

* Recognized as one of the great world powers alongside Rome (and later the Eastern/Byzantine Empire) for about four centuries, locked in recurring wars across the Near East.

So, if you need a single, simple answer for most school or quiz contexts, you can say:

The major empire that bordered ancient Rome to the east was the Parthian Empire , and later the Sasanian Persian Empire.

Why this matters now

Historians today often frame Rome–Parthia–Sasanian relations as an ancient version of a great-power rivalry system, similar to modern border standoffs between large states. This perspective shows that Rome was never an isolated Mediterranean giant, but part of a broader Afro-Eurasian network that also included powerful empires further east, like those in India and China.

TL;DR: It was mainly the Parthian Empire , followed by the Sasanian Persian Empire , that formed the great eastern border rival of ancient Rome.

Information gathered from public forums or data available on the internet and portrayed here.