It was his mother, St Helena
Constantine ruled over the Roman Empire from 306 to 337 AD
Constantine I (or the Great )was the 57th Roman Emperor. Therefore, he became famous in the Roman Empire.
Emperor Constantine ruled the Roman Empire from 324 AD- 337 AD
The closest answer is: b first Christian emperor. There is some evidence that Emperor Philip (244-249) might have been a Christian some seventy years before the time of Emperor Constantine.
Constantine was Emperor of Eastern Rome at the time that the Roman Empire split in half.This split was caused by Christianity, and Constantine was actually the first Christian ruler of Rome. The capitol of the Byzantine Empire (as which it was called) was Constantinople.
Constantine never ended any empire. He ceased to be emperor when he died.
AnswerThe general consensus is that Emperor Constantine I (306-337) was the first Christian emperor of Rome. Certainly, he made his support for Christianity clear. Some say that Emperor Philip (Philip the Arab, 244-249) was a Christian and was therefore the first Christian emperor. This is difficult to prove as, unlike Constantine, Philip gave no undue support to Christianity and made no attempt to persecute the pagan temples or discourage their use.Others argue that Constantine was not a true Christian, and only chose to make the Empire Christian to unite it under one faith.
Justinian I, Leo III, John I Tzimisces, Basil II, Manuel I
That would be Theodosius. Constantine had previously made it legal to be christian in the Western Roman Empire, but Theodosius made it the official religion, and therefore made it illegal to belong to any other religion.
Constantine promoted Christianity, but not in the Byzantine Empire. Constantine was emperor of Rome from 306 to 337 CE, but the Byzantine Empire came into existence in 395 CE, when Arcadius became emperor of the Eastern Empire, separating from the Western Roman Empire.
Emperor of the Roan Empire.
Constantine