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In 313 AD, Emperor Constantine legalized Christianity in the Roman Empire.  A religion developed on the belief in the coming of the Christ (Messiah in Judaism), Christianity started as a denomination in Judaism based on the teachings of Jesus, a young Jewish rabbi in Nazareth.  Rooted in both Jewish and Greek ideas and practices, Christianity was also influenced by Mithraism in the Roman Empire, an offshoot of the Persian religion Zoroastrianism.  After the death of Jesus, his disciples spread it to the non-Jewish populations in the Roman empire.  Especially in the hands of Paul of Tarsus, Christianity became a universal religion.