It was said that during the time of Crassus' Eastern Campaign, the Artaxiad dynasty supported Rome in hope to gain lands and independence from Parthian overlordship.
Suppose that Crassus managed to avoid Sureena and sacked some Parthian cities, all while Artavasdes, King of Armenia, managed to defeat Orodes, King of Parthia, and pressed his luck by invading Persia proper and pressed Tigranes II's old claim on the Persian Throne.
Sure, there are Romans and they would definitely try to have a say in that matter, but then, Crassus might be satisfied with some Mesopotamian holdings while Artavasdes claimed the rest of Persia (and backstabbings isn't exactly unknown).
Let's say the Romans somehow get distracted over their alternate civil war, and Armenian dynasty of Persia end up sticking for a considerable amount of time. What will happen next?