Yes its a fair point about Hannibal. He bitchslapped the Romans all over their home turf.
The Gauls did it in 380 BC, well out of our timeframe. After that it was salami tactics from Bononia to Belgium, almost all one-way traffic.
The Germans ambushed a few incompetents on the frontier but never ever won a stand up fight against a Roman army. Ever. Also at least as many germans fought for Rome as against it, hardly sworn enemies.
The Parthians gave some thrashings but as pointed out that was in the East, they didn't really get serious like the Achaemenids did vs Hellas or the Sassanids vs East Rome. Rome vs Parthia was more neighbours hosing each others' dogs than a la outrance.
The Pontians? Obviously the Mithradatic wars were a nasty surprise but was there a serious threat to Romes existence, or was it an oriental imbroglio that barely interupted the civil disturbances of the day? Like the Diadochi, the various dynasties of asia minor didn't pose a mortal threat to Rome, and for the purposes of the proposed mod they weren't part of any broader political entity that could be constructed along the lines of Vanilla Rome's senate and factions.
I guess vanilla has already done the "Rome as multiple factions" set-up.
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