The Emperor Justinian, ruled the Byzantine Empire. he did his job well being emperor. He kept most of the roman laws and improved it to be more logical.
Constantinople was a city, this place was surrounded by sea on all 3 sides of its walls and land, and it constantly attracted new people.
Then there were churches, but then they were seperated because people argued about the religions so they seperated it with the eastern and western churches. The eastern churches were led by Patrians and priests could marry.
But when Justinian died in 565, the new emperor nearly used almost all of the empire's debts on the army's.
But to make things worse in the Empire, a deadly plague started spreading, with rats that carried the disease went on to ships that had crates with grain
But then in 1453, Mehmed II, launched an army 100,000 men to Constantinople. it was only defended by 7,000 men on the outside walls, finally they striked the empire a final time and killed the last emperor of Constantinople, Constantine XI.