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During the Crisis of the Third Century, two separate empires seceded temporarily and held out quite a while: the Gallo-Roman Empire in the West, and the Palmyrean Empire in the East. Both were threatened parts of the empire, and not exactly the economic powerhouses of the empire.

What if (instead - or, if you like to, additionally) a usurper secedes with Aegyptus, Cyrenaica, Africa and Mauritania instead? As far as I know, Egypt and Tunisia were the breadbaskets of the empire, and Egypt was populous as hell.
Rome wouldn`t let that pass?
But who would be strong enough to win back the South?
What would aid the defenders? What would be their weaknesses?
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