According to Islamic tradition, the founder of the religion was the prophet Mohammad, who was born in Mecca in 570 C.E. When Mohammad was at the age of 40, Allah (the name of God in Islam) revealed himself to Mohammad as the one true God, and, through the Angel Gabriel, delivered the teachings that would become the Islamic holy book known as the Qu'ran. The Qu'ran defines Islam as the religion of the one true God, it outlines the rules and requirements for behavior and describes the conditions that would bring about the end of the world and the Apocalypse. In the Saudi Peninsula of Mohammad's day, the monotheistic Judaism and Christianity were well established, and there were many followers of ancient polytheistic traditions. Islam took hold because of Mohammad's military and political prowess, and remains a dominant world religion to this day. Mohammad died in 632 C.E.