The capital of the eastern half of the Roman Empire was Constantinople.
The western half of the Roman Empire faced serious fall due to invasions by Barbarian tribes and Civil war with the Eastern Empire.
Step-by-step explanation:
The post-Republican period of ancient Rome was considered as the Roman Empire. The Roman Empire was famous for its most extensive political and social structure in western civilization.
According to Romans, Barbarians are people who are not the citizens of Rome and who could not speak Latin.
"Huns invading" from the east was the major reason of fall of Roman Empire. During the late third century, the Western Rome was partially sealed.