Muhammad born in Mecca, Saudi Arabia in 570 A.D. was believed to be the final prophet sent by God. In 610 an angel named Gabriel visited him while he was meditating in a cave and ordered him to recite the words of Allah.
From 613, Muhammad began preaching throughout Mecca. He taught his people there was no other God but Allah and Muslims should devote themselves to this god.
In 622, Muhammad travelled from Mecca to Medina with his supporters. This journey is known as the Hijra and marks the beginning of the Islamic Calender.