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I developed this new challenge: to develop a short TL where Rome managed in some way between Actium and 476 AD (so in Imperial age) to conquer and romanize Persia, and survived the most possible, better if until modern day. It can be still Zoroastrian or become Manicheist or Christian or what else, even Induist or Buddhist if it expands or be influenced by India, but not Islamic: it's the only condition to respect because Islamic invasion will means end of the Empire. Lastly, if you want you can let survive other Roman nations but is better if Roman Persia survived as only bearer of the Romanitas.