But along with that, he redefined what a province is, so you had smaller provinces, which then would go into diocese, which would then go into prefects, which would then go into a tetrarch. Once you have the start of the Byzantine Empire, they would have elements of this. Constantine, and remember, Constantine wasn't only, the Byzantine wasn't only the emperor of the east. He was emperor of both east and west, but he got rid of the tetrarchy, but he kept Diocletian's notions of these smaller provinces going into diocese, going into prefects. So you have that continuity, but then later on, in the mid-7th century, it was turned into more of a feudal theme system in the Byzantine Empire. Once again, this was under Heraclius, who also made Greek the official language. And the reason why I say it's feudal, it was comparable to the feudal system in Western Europe at the time, was that it provided land grants to local rulers in exchange for their military service and the ability for them to send resources up to the emperor.