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The Crisis of the Third Century, while not exactly a subject I'm overly familiar, is an intriguing case that I actually want to learn about. The crisis as we all knew, spawned three states, a Gallic Empire (who controlled Britannia, Gallia & Hispania) seeking to conquer Rome, a possibly weak Palmyrene Empire (who controlled Egypt, the Levant and the Interior of Anatolia), and a Rump Roman Empire.

However what if say Aurelian and Diocletian failed to successfully defeat the rival states (more so in the case of Gallia than Palmyra), and reform the Empire to survive for the next 2 centuries.

Basically long story short, how can the Roman Empire at its height remain divided between the three for an extended period of time?
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