Muhammad was born around 570, AD in Mecca (now in Saudi Arabia). His father died before he was born and he was raised first by his grandfather and then his uncle. He belonged to a poor but respectable family of the Quraysh tribe. The family was active in Meccan politics and trade.
Many of the tribes living in the Arabian Peninsula at the time were nomadic, trading goods as they crisscrossed the desert. Most tribes were polytheistic, worshipping their own set of gods. The town of Mecca was an important trading and religious center, home to many temples and worship sites where the devoted prayed to the idols of these gods. The most famous site was the Kaaba (meaning cube in Arabic). It is believed to have been built by Abraham (Ibrahim to Muslims) and his son Ismail. Gradually the people of Mecca turned to polytheism and idolatry. Of all the gods worshipped, it is believed that Allah was considered the greatest and the only one without an idol.
In his early teens, Muhammad worked in a camel caravan, following in the footsteps of many people his age, born of meager wealth. Working for his uncle, he gained experience in commercial trade traveling to Syria and eventually from the Mediterranean Sea to the Indian Ocean. In time, Muhammad earned a reputation as honest and sincere, acquiring the nickname "al-Amin" meaning faithful or trustworthy.
In his early 20s, Muhammad began working for a wealthy merchant woman named Khadijah, 15 years his senior. She soon became attracted to this young, accomplished man and proposed marriage. He accepted and over the years the happy union brought several children. Not all lived to adulthood, but one, Fatima, would marry Muhammad's cousin, Ali ibn Abi Talib, whom Shi'ite Muslims regard as Muhammad's successor.