And not only does he set that up, but he sets up what's called a tetrarchy. Beyond himself and his co-emperor, they each have a second in command that if any one of them were to die or would have to retire somehow, that that second in command could take over. And once again, this is to address some of the issues of the Third Century Crisis, where the wars for succession, and this isn't just during the Third Century Crisis, we've seen in multiple videos, Rome is famous, even during the Pax Romana, for these really ugly succession battles. But as we'll see, the splitting of the empire into east and west, even though it started as an administrative thing, over time it's going to become a real split and they're going to turn into two different empires. Now after Diocletian, you have another significant emperor. You have Constantine. And Constantine is known for many things.