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alternatehistory.com
In OTL in late 36 Emperor Constantius II asked Caesar Julian to send him reinforcements from his legions in Gaul to the eastern front.
Upon hearing this the Gallic legions mutinied and proclaimed Caesar Julian as Augustus.
Constantius II was enraged by his cousin's betrayal but the course of war didnt allowed him to send forces against Julian and through negotiations tried to convince Julian to abdicate and he would be granted amnesty for the mutiny.
However by next year negotiations collapsed and Constantius II took advantage from a cease-fire with the Persians to deal with Julian's rebellion.
But when he reached Cilicia he fell ill and died a few days later having aknowledged Julian as his heir...
WI Constantius II doesnt die in November 361 but he lives to face Julian in battle?
How is another round of Roman civil wars affects History?