Your question is very unclear. Constantinople was a Roman city, it was the imperial capital of the eastern part of the Roman Empire (the imperial capital of the western part of the Roman Empire was Milan).
Christianity was the religion enforced by Constantine throughout the Roman Empire. Hence the naming of the second Rome after him, ie. Constantinople, the capital of Byzantium.
Constantinople becomes capital of Roman Empire
By Roman art we usually mean art from the Roman empire. When Emperor Constantine introduced Christianity as state religion, the center of the empire moved to Constantinople. After this we talk about Byzantine art which is mainly religious.
For how many years constantinople the capital of a united roman empire ?
Constantinople.
The longest Roman aqueduct was Constantinople.
Roman Empire
Constantinople was the capital of the Roman Empire under Emperor Constantine the Great around 330 AD.
It restructured itself and continued on for another thousand years. Today we call it the Byzantine Empire as it was based on Byzantium, renamed Constantinople.
Constantinople did not have a capital, it was a capitol. It was the capital of the Byzantine or Eastern Roman empire.
The Roman Empire lasted in Constantinople, known as Byzantium before its renaming, for over a millennium after the fall of the Western Roman Empire in 476 AD. The Eastern Roman Empire, commonly referred to as the Byzantine Empire, continued until the fall of Constantinople to the Ottoman Turks in 1453. This marks a duration of approximately 977 years in which Constantinople served as the capital of a Roman state.
Constantinople.