So Gaul is modern day France and some other surrounding regions. And he is so powerful that when he comes back to Rome, a civil war ensues. And Julius Caesar is able to essentially win the civil war, declare himself a dictator. And then his adopted son, Augustus, right over here, is in 27 BCE declared emperor. And that's the beginning of the Roman Empire. And we keep going, and I think I've already mentioned it once in this video, but eventually we get a split in the fourth century CE, where we have eastern and western halves of the Roman Empire. The western side centered at Rome, the eastern side centered at what was originally Byzantium, renamed Constantinople, and today Istanbul.