Constantinople was approximately 800 miles east from Rome.
Constantinople
The capital of the Roman empire was Rome and later Ravinia, in the West. In the East it was Constantinople.
Rome's political capital was the city of Rome. It was briefly moved to Ravinia, and then Constantinople became the capital.
Eastern Rome was Rome and western Rome was Constantinople
Constantinople or Istanbul
Constantinople
Constantinople was the Capital of Rome for over a 1000 Years.
The emperor Constantine I (or the Great) did not move the imperial capital of the roman Empire from Rome to Byzantium. He moved the imperial capital of the eastern part of the Roman Empire from Nicomedia (in north-western Turkey) to the nearby Byzantium, which he redeveloped and renamed after himself -- Constantinople (City of Constantine). Milan remained the imperial capital of the western part of the empire.Nicomedia and Milan had been designated as the imperial capitals of the east and west respectively by the emperor Diocletian. Rome had already ceased to be the imperial capital before Constantine.
Constantine the Great
Because the capital of the Roman Empire was transferred from Rome to Constantinople in 330 AD.
Emperor Constantine the Great moved the capital of the Byzantine/Roman Empire from Rome to Constantinople around 330 AD.
Emperor Constantine the Great moved the capital of the Byzantine/Roman Empire from Rome to Constantinople around 330 AD. He felt that Rome was an unsatisfactory capital. Rome was too far from the frontiers. Constantinople provided easy trade and military access to the Mediterranean, Black Sea, Danube River, Dnieper River, and the land route to Turkestan and India.