SINCE the days of Carthage and Hannibal we have said nothing of the Semitic people. You will remember how they filled all the chapters devoted to the story of the Ancient World. The Babylonians, the Assyrians, the Phoenicians, the Jews, the Arameans, the Chaldeans, all of them Semites, had been the rulers of western Asia for thirty or forty centuries. They had been conquered by the Indo-European Persians who had come from the east and by the Indo-European Greeks who had come from the west. A hundred years after the death of Alexander the Great, Carthage, a colony of Semitic Phoenicians, had fought the Indo-European Romans for the mastery of the Mediterranean. Carthage had been defeated and destroyed and for eight hundred years the Romans had been masters of the world. In the seventh century, however, another Semitic tribe appeared upon the scene and challenged the power of the west. They were the Arabs, peaceful shepherds who had roamed through the desert since the beginning of time without showing any signs of imperial ambitions. Then they listened to Mohammed, mounted their horses and in less than a century they had pushed to the heart of Europe and proclaimed the glories of Allah, "the only God," and Mohammed, "the prophet of the only God," to the frightened peasants of France. The story of Ahmed, the son of Abdallah and Aminah (usually known as Mohammed, or "he who will be praised,"); reads like a chapter in the "Thousand and One Nights." He was a camel-driver, born in Mecca. He seems to have been an epileptic and he suffered from spells of unconsciousness when he dreamed strange dreams and heard the voice of the angel Gabriel, whose words were afterwards written down in a book called the Koran. His work as a caravan leader carried him all over Arabia and he was constantly falling in with Jewish merchants and with Christian traders, and he came to see that the worship of a single God was a very excellent thing. His own people, the Arabs, still revered queer stones and trunks of trees as their ancestors had done, tens of thousands of years before. In Mecca, their holy city, stood a little square building, the Kaaba, full of idols and strange odds and ends of Hoo-doo worship. Mohammed decided to be the Moses of the Arab people. He could not well be a prophet and a camel-driver at the same time. So he made himself independent by marrying his employer, the rich widow Chadija. Then he told his neighbours in Mecca that he was the long-expected prophet sent by Allah to save the world. The neighbours laughed most heartily and when Mohammed continued to annoy them with his speeches they decided to kill him. They regarded him as a lunatic and a public bore who deserved no mercy. Mohammed heard of the plot and in the dark of night he fled to Medina together with Abu Bekr, his trusted pupil. This happened in the year 622. It is the most important date in Mohammedan history and is known as the Hegira--the year of the Great Flight.