252 A BRIEF SURVEY OF HUMAN HISTORY had also been, though only nominally, a province of several Empires in succession, viz., of Egypt, Persia, Macedonia, Rome, and Constantinople. But it was now her turn to build up an Empire of her own which would challenge comparison with the greatest. This was due to the sudden rise of a new religion. For centuries before Muhammad preached Islam (622-632 A.D. i the people of Arabia had stagnated in the back-waters of their desert peninsula. They led a wild and nomadic life of unrelieved tribal struggles, except during a part of the year when, as in ancient Greece during the Olympic festivities, the * truce of God' was proclaimed to enable all the Arabs to meet in Mecca for worship at the shrine of Kaaba. This comprised a cubical black stone, which was believed to have fallen from Heaven, and supplied the only unifying factor in an otherwise chaotic world. For the rest of the year the Arabs worshipped their own tribal deities, indulged in their blood-feuds, or revelled in their incontinent orgies. Music was the only elevating influence in their lives. It was in such a world that the Prophet Muhammad was born (c. 570 A.D.). He belonged to the distinguished clan of Qureishis, who controlled the sacred shrine of Kaaba, though his family was rather poor in worldly possessions. Nothing eventful happened to Muhammad until he was forty years of age, unless it be his marriage with a rich widow named Kadijah who was by several years his senior. Then came his great * conversion' when the Angel Gabriel brought to him the message of Allah. After this revelation Muhammad boldly proclaimed his famous gospel : " There is no god but God, and Muhammad is His prophet" Although this formula has become to-day the creed of about 300,000,000 people (of whom over one-fifth are in India), the Prophet was not honoured at first in his own land. Like