alternatehistory.com

For the longest time, the Persians was a thorn in the Romans side that only got worst as time went on. First the Parthians, and then the Sasanian Empire seemly became trapped in a cycle of 'tug of war' for the region, first with the Roman Republic, then the Roman Empire, and at last the Eastern Romans. The end result was the two sides simply weaken to the point of the Arabs going to town on both Eastern Romans and Persians. And the rest is history.

Your mission here is to have the Romans conquer and hold Persia for as long as possible/have them deal with Persia and the affects from this at any given time.
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