which he came south to Arabia with both foot-soldiers and a fleet of ships into Mecca. The Persian intervention prevented Christianity from spreading eastward into Arabia, and Mecca and the Islamic prophet Muhammad who was at the time a six year boy in the Quraysh tribe "would not grow up under the cross."
By the middle of the 6th century, there were three major settlements in northern Arabia, all along the south-western coast that borders the Red Sea, in a habitable region between the sea and the great desert to the east. This area, known as the Hejaz, featured three settlements grown around oases, where water was available. In the centre of the Hijaz was Yathrib, later renamed Medina, from "Madinatun Nabi", or "City of the Prophet." 250 mi (400 km) south of Yathrib was the mountain city Ta’if, north-west of which lay Mecca. Although the area around Mecca was completely barren, it was the wealthiest of the three settlements with abundant water via the renowned Zamzam Well and a position at the crossroads of major caravan routes.
The harsh conditions and terrain of the Arabian peninsula meant a near-constant state of conflict between the local tribes, but once a year they would declare a truce and converge upon Mecca in an annual pilgrimage. Up to the 7th century, this journey was intended for religious reasons by the pagan Arabs to pay homage to their shrine, and to drink from the Zamzam Well. However, it was also the time each year that disputes would be arbitrated, debts would be resolved, and trading would occur at Meccan fairs. These annual events gave the tribes a sense of common identity and made Mecca an important focus for the peninsula.
Camel caravans, said to have first been used by Muhammad's great-grandfather, were a major part of Mecca's bustling economy. Alliances were struck between the merchants in Mecca and the local nomadic tribes, who would bring goods – leather, livestock, and metals mined in the local mountains – to
