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I'm sure this has been asked before, but I was inspired by this thread (https://www.alternatehistory.com/forum/threads/wi-ahc-sites-for-a-western-roman-empire’s-version-of-constantinople.444795/) to ask if when/how the Roman Empire could have been split into three instead of two, under the following borders:

East, based in Constantinople - Same as OTL: Moesia, Greece, Macedonia, Thrace, Anatolia, Syria, Palestine, Egypt.
Central, based in Milan/Ravenna - The Praetorian Prefecture of Italia plus the Diocese of Pannonia
West, based in Augusta Treverorum - Same as OTL: Gaul, Britain, Spain and Mauretania.

Any thoughts? My first thought was one of Thedosius I's sons by his second wife Galla (Gratian or John) surviving. But perhaps that would be too late. Maybe a POD with Valentinian I, Valens and their sons?
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