My Answer: The Byzantine Empire.
Why?: " As a result of these advantages, the Eastern Roman Empire–variously known as the Byzantine Empire or Byzantium–was able to survive for centuries after the fall of Rome."
Hope I helped! :D
What about the federal Government? What is it?
Manorialism, also called manorial system, seignorialism, or seignorial system, political, economic, and social system by which the peasants of medieval Europe were rendered dependent on their land and on their lord.
