Emperor of the Roan Empire.
It was the time in which Constantine the Great ruled Ancient Rome.
Constantine is important to ancient Rome because he was the first emperor of Christianity.
Constantine
"He decided on the ancient Greek city of Byzantium. And on 8 November AD 324 Constantine created his new capital there, renaming it Constantinopolis (City of Constantine). He was careful to maintain Rome's ancient privileges, and the new senate founded in Constantinople was of a lower rank, but he clearly intended it to be the new center of the Roman world."So Constantinopolis would be your answer.Source: http://www.roman-empire.net/decline/constantine-index.html
"He decided on the ancient Greek city of Byzantium. And on 8 November AD 324 Constantine created his new capital there, renaming it Constantinopolis (City of Constantine). He was careful to maintain Rome's ancient privileges, and the new senate founded in Constantinople was of a lower rank, but he clearly intended it to be the new center of the Roman world."So Constantinopolis would be your answer.Source: http://www.roman-empire.net/decline/constantine-index.html
Constantine
Yes, as all ancient emperors would be considered ruthless by our standards. This is why we have to be careful in appraising them, as our present day standards are different from the ancient standards. In the case of Constantine, however, even by ancient standards he was ruthless as he murdered his own son and also his wife.
He was the first Christian ruler in ancient Rome/Greece.
When Constantine converted Christian, then Christianity became a state religion for the Roman Empire.
The notable rule of the ancient Roman emperor Constantine began in 307 AD/CE and lasted until 337 AD/CE.
To transform the ancient Greek colony of Byzantium into a new residence
Paul the Apostle, Emporer Constantine, and others