Muhammad is the founder and chief prophet of Islam and the source for the Quran. "Muhammad" - whose name means "highly praised" - was born in Mecca in 570 AD. His father died shortly before his birth, and he lost his mother at the age of six. Muhammad was then raised primarily by his uncle, for whom he worked as a shepherd. At age 9 (some sources say 12), he joined his uncle on a caravan to Syria. As a young man, Muhammad worked as a camel driver between Syria and Arabia. Soon he established a career managing caravans on behalf of merchants. Through his travel first with his uncle and later in his career, Muhammad came into contact with people of many nationalities and faiths, including Jews, Christians and pagans. (Comparison chart: Islam, Judaism, and Christianity.)
At age 25, Muhammad was employed by Khadija, a wealthy Meccan widow 15 years his senior. The two were married, and by all accounts had a loving and happy marriage. Early records state that "[Allah] comforted him through her, for she made his burden light." Although polygamy was common practice at the time, Muhammad took no other wife until her death 24 years later.