Christian and Islam Timeline By williams828 30 Jesus of Nazareth began his preaching. 33 Jesus of Nazareth is executed and resurrected in Jerusalem. 64 The Roman emperor Nero outlaws Christianity in Rome. 312 Constantine became a Christian in Rome. 392 Theodosius makes Christianity the official religion of Rome. 570 Muhammad is born in Makkah 622 Muhammad moved to Yathrib 632 Muhammad died at age 62 716 Emperor Leo III outlawed all icons in churches 830 The Abbasid caliph Mamun founded the House of Wisdom in Baghdad. 1055 The Seljuks seized Baghdad. 1258 The mongols stormed into Baghdad.