Born in Mecca in the year 570, Muhammad grew into a sensitive and thoughtful man who believed deeply in the worship of one true god.
In his fortieth year, Muhammad experienced a revelation from the angel Gabriel that he, Muhammad, was the messenger of God. Over the next twenty-three years, he received many such revelations, all of which were written down by scribes at the time of revelation to become the Koran, the sacred scripture of Islam, a religion that is practiced by nearly one-quarter of the world's population and holds as its most sacred tenet that there is no god but God.