That happens under the Qin Dynasty, Q-I-N, Qin Dynasty, that preceded the Han Dynasty. And they were able to do that by being very strong, very authoritarian, very centralized. But once the Qin Emperor dies, it leaves a clear power vacuum. And then you have a succession battle, but eventually the Han Dynasty is formed. And one of the ways that the Han Dynasty is able to keep power, despite not being as authoritarian as the Qin, is that they revitalize Confucianism and use that ideology and use that culture in order to more unify the Chinese people. The Roman Empire we study in some detail. It's hard to pin a date on exactly when it becomes an empire.