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As above. I'd like it to be as as clean win as possible, so let's say that Theodosius dies in accident (real one)when Maximus is met with Theodosius forces in 383. When it becomes apparent that Theodosius is dead, his troops defect to Maximus who now only has to deal with 12 year old Valentinian II...
Most bloodless civil war in Roman history it seems- just 2 deaths (or one if Valentinian isn't killed)