And the Eastern later gets known as the Byzantine Empire. That goes on for another thousand years until it's, as I mentioned, I think earlier, taken over by the Ottomans. But to get more of an appreciation for how the Roman Empire grew and then eventually starts to shrink, I have some maps over here. So this first map, this is roughly from the third century BCE. And third century BCE, you might remember, Rome is a republic at this time. But it's not the dominant power in the Mediterranean. Just to give ourselves some bearings, you might remember that in the late fourth century BCE, that's when Alexander conquers much of, or most of, Greece, Macedonia, the Persian Empire, which included at the time, Egypt.