Saudi Arabia traces its roots back to the earliest civilizations of the Arabian Peninsula. Over the centuries, the peninsula has played an important role in history as an ancient trade center and as the birthplace of Islam, one of the world's major monotheistic religions.

Located between the two great centers of civilization, the Nile River Valley and Mesopotamia, the Arabian Peninsula was the crossroads of the ancient world. Trade was crucial to the area's development; caravan routes became trade arteries that made life possible in the sparsely populated peninsula.

The people of the peninsula developed a complex network of trade routes to transport agricultural goods highly sought after in Mesopotamia, the Nile Valley and the Mediterranean Basin. These items included almonds from Taif, dates from the many oases, and aromatics such as frankincense and myrrh from the Tihama plain.  Spices were also important trade items. They were shipped across the Arabian Sea from India and then transported by caravan.

The huge caravans traveled from what is now Oman and Yemen, along the great trade routes running through Saudi Arabia's Asir Province and then through Makkah and Madinah, eventually arriving at the urban centers of the north and west.

Around the year 610, Muhammad, a native of the thriving commercial center of Makkah, received a message from God (in Arabic, Allah) through the Angel Gabriel.  In 622, learning of an assassination plot against him, Mohammad led his followers to the town of Yathrib, which was later named Madinat Al-Nabi (City of the Prophet) and now known simply as Madinah. This was the Hijrah, or migration, which marks the beginning of the Islamic calendar.