They start getting ruled separately, and as you get into the latter half of the fifth century, the Western Empire itself falls to Germanic conquerors. Now in previous videos, we talk about how the emperors who rule from Constantinople consider themselves to continue the Roman Empire. They didn't call themselves the Byzantine Empire, as we now call them. They called themselves the Roman Empire. They considered themselves Roman emperors. The west falls, as I just mentioned, into a bunch of Germanic kingdoms. Justinian is able to reclaim a lot of the land formerly lost in the Western Roman Empire.