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Emperor Constantine the Great was a prominent Roman ruler known for his pivotal role in the Christianization of the Roman Empire. Born in 272 AD, Constantine rose to power after defeating his rivals in civil wars. He issued the Edict of Milan in 313 AD, granting religious tolerance to Christians. Constantine convened the First Council of Nicaea in 325 AD, leading to the establishment of Christian orthodoxy. He also moved the capital of the Roman Empire to Byzantium, renaming it Constantinople. Constantine's reign marked a significant shift towards Christianity in the Roman Empire.