Is there a possibility for the Roman Empire to be split into two (or more) states earlier than 395 AD?
I see at least two possibilities, but I don't know how plausible they are :
-The Third Century Crisis is never resolved. We thus end up with an independant "Gallic Empire" in the West, a "Kingdom of Palmyrene" in the East and a rump "Roman Empire" in the Center.
-The Empire splits permanently during the Tetrarchy.