And in 1453, that also gets sacked by the Ottomans. And that's the official end of the Byzantine Empire, the Eastern Roman Empire, which you can see continues on for another thousand years after the fall of the Western Roman Empire. Now with that review out of the way, let's think about how the Byzantine Empire was the same and different from the Roman Empire. So first let's think about the center of power. Well, the Roman Empire is named after its seat of power during the great majority of its history. The seat of power of the Roman Empire is Rome. Near the end of the Western Roman Empire, it becomes Ravenna.