The "he" here is Constantine the Great, and he moved the capital of the Roman Empire to the city named Constantinopole, previously Byzantium, which today is known as Istanbul, Turkey's biggest city.
Answer:
Officers in the army now achieved promotion based on their social status. They now organized into more permanent social rankings. Officers in the army now achieved promotion due to their ability and merit.
Explanation:
I think the answer to the top one is b and on the second one d
