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Persecutions ceased altogether under Constantine, who believed that the Christian God had bought him to power. Under the
Edict of Milan in 313, all penal edicts against Christians were rescinded. The Christianisation of the Roman Empire had begun.
[The importance of the
http://en.wikipedia.org/wiki/Constantine_the_Great_and_Christianity”]Emperor Constantine in the establishment of the Christian religion cannot be underestimated, because his actions placed the Catholic Church in a position of great authority which was to hold great sway once the power of Rome declined.
Constantine’s attitudes towards Christians went far beyond that of mere toleration. Bishops were made his counsellors and were allowed to use the Imperial postal service, an invaluable privilege at a time when overland travel was expensive and dangerous. A law of 333 ordered imperial officials to enforce the decisions of Bishops and to accept the testimony of Bishops over other witnesses. Constantine donated the imperial property of the Lateran to the Bishop of Rome as a site for a basilica and he promulgated laws giving the Christian clergy fiscal privileges and legal immunity. Constantine was of the opinion that when the Christians were free to render supreme service to the Divinity, they confered great benefits upon the affairs of state. Constantine called the first ecumenical
Council of Nicaea in AD 325. Ecumenical refers to a ‘world view’ and Constantine did not want divisions within the Church and considered that such things were as “formidable as any war or battle”.
Another momentous decision by Constantine was to move his capital from Rome to
Byzantium. It was officially declared as capital of the Roman Empire in AD 330 and renamed Constantinople after the death of the Emperor. Constantine greatly enlarged the city, building public buildings and many churches. He also held more Church councils at nearby cities such as Nicaea and Chalcedon, thus refining Church doctrine and unifying Christianity even further. In 381 Byzantium became the seat of a Patriarch, with the same status as Rome, Antioch, Alexandra and Jerusalem.
On Constantine’s death, his successor,
Julian the Apostate tried to revive the old Roman religions at the expense of Christianity, but his reign was short. His successor,
Jovian restored Christianity to the levels of privilege enjoyed under Constantine. Jovian, like his predecessor Julian, lost great areas of the eastern empire to the Persians, including Christian Armenia.
Ambrose, Bishop of Milan, who is credited with converting a young
Augustine of Hippo, wrote that while Rome became Christian, Christianity became Roman by adopting a system of administration and a body of law like those of the empire and employing the same personel. For this, Constantine can be credited, for his idea that dissenting beliefs within the Church were as bad as an advancing army upon the Empire itself. Augustine’s theory of a Just War would one day be used to defend the Christian Empire and his rule, used to set up his Christian community in Hippo, would one day influence the setting up of monastires and Christian orders of knighthood.
The division of the Roman Empire into two, east and west, made weakened the influence of Rome in matters of state. The eastern half became the Byzantine Empire and embraced Greek language and culture. Both halves of the Empire were constantly at war with tribes and peoples from beyond their borders. In Asia, the Persians were a constant menace and in the west, across the danube and the Rhine, the barbarian tribes od Sarmatians, Ostrogoths, Visigoths, Franks, Bergundians, Alamanni, Quadi, Vandals and behind them, pushing forward for unknown reasons from the steppes, the ferocious tribe of Huns. The line could not be held as a rush of “immigrants” pushed into Roman territory.
In AD 410 Rome was sacked by
Aliric the Visigoth.