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alternatehistory.com
For the uninformed the Crisis of the Third Century was a major stumbling block for the Roman Empire. After Emperor Severus Alexander was killed by his troops in 235. This sparked a 26 year long civil war that brought Rome to its knees. As Emperors came and went like the seasons Rome suffered plague and economic depression. Eventually Rome splintered into three different Empires, the Gaelic Empire in the West, the Roman Empire in the Center and the Palmyrene Empire in the East. The Crisis would begin to end when Emperor Aurelian united the Empire between 270 and 275 and would finally end with Emperor Diocletian's reforms in 284.
Lets say that the Crisis never really ends. Rome is never reunited and the Gaelic and Palmyrene Empires continue to live on. What affect does this have on history?