Imperial rule in Byzantium and Russia?

Answer:
Byzantium and Russia were different empires with many rulers in their long existence as empires.In Byzantium the emperor was called Autocrat and in the late Russian empire it was called Czar or Tsar.
Contributor: Konstantinos
First answer by Konstantinos Masouras. Last edit by Konstantinos Masouras. Contributor trust: 24 [recommend contributor recommended]. Question popularity: 20 [recommend question].