An idea that has interested me is if the four Roman prefectures; Gallia, Italia, Illyricum, Oriens, become four different empires, completely separate to one another. I've got names for the new empires too; the Gallic Empire, the Italian Empire, the Illyrian Empire and the Empire of Oriens. What if?
Edit: this is an AHC.
Edit: this is an AHC.