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What sequence of events would it take for the Romans to establish permanent frontiers along the Zagros Mountains and the Vistula/Dneister river systems, along with a Hadrian's Wall-like structure cutting across the Jutland peninsula along the modern border that divides Denmark and Germany?
I am thinking of doing a timeline that includes this scenario along with a successful Boudicca's Rebellion that manages to throw Rome out of the British isles permanently.