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Constantine helped spread Christianity throughout the Roman Empire. He issued the Edict of Milan in 313, which granted religious tolerance to Christians and allowed them to practice their faith openly. Constantine's conversion to Christianity and support of the religion played a significant role in its growth and development.
Christianity
As Roman Emporer, Constantine declared Christianity to be the official religion of the Roman Empire. At the time, the Empire was vast, so Christianity spread quickly.
Constantine
In 313AD, Constantine issued the Edict of Milan legalizing Christian worship.
He ended the persecution of Christians
Both Islam and Christianity religions were spread through people free choice and will. However, the early spread of Islam was through fighting against the pagans who were attacking Muslims from time to time. While the early wide spread of Christianity was through the convert of the emperor Constantine to Christianity and accordingly persuaded the empire people to convert to Christianity.
Paul the Apostle, Emporer Constantine, and others
The Edict of Milan helped spread Christianity by allowing all religions in Rome.
Emperor Constantine I and his mother Helena.
Constantine the Great had himself baptised just before his death.
Constantine the Great did not spread Christianity. By the time of his reign, Christianity had already spread and had already become the religion of the masses in the Roman Empire, although there were still many pagans. Constantine supported the Christians. He arbitrated between different doctrines of Christianity, promoted Christians in the imperial administration and built Christian Churches. The most notable of these churches were the original Basilica of St Peter's in Rome, the St John Lateran's Basilica (the city of Rome's first Cathedral and the original residence of the Popes), the Church of the Holy Apostles in Constantinople and Church of the Holy Sepulchre, in Jerusalem.