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How plausible is it for the Parthian Empire, which suceeded the Seleucid Empire and preceded the Sassanian Empire, to become a power comparable or at least almost comparable to Rome when it comes to its territory and military prowess?
I was thinking about Parthia managing to keep a hold of Armenia, eastern Anatolia, and Syria. Which borders are both the biggest and most stable for this wanked Parthia?
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