But though the native tribes of the peninsula were idolaters, still there were many followers of other faiths; for Arabia at this time was a land of religious freedom. The altar of the fire-worshipper rose alongside the Jewish synagogue and the Christian church. The Jews especially were to be found everywhere in great numbers, having been driven from Palestine by the Roman persecutions. It was from the Jews and Christians, doubtless, that Mohammed learned many of the doctrines that he taught. MOHAMMED.--Mohammed, the great prophet of the Arabs, was born in the holy city of Mecca, about the year 570 of our era. He sprang from the distinguished tribe of the Koreishites, the custodians of the sacred shrine of the Caaba. Like Moses, he spent many years of his life as a shepherd. [Illustration: MOSQUE AND CAABA AT MECCA. (From a photograph.)] Mohammed possessed a deeply religious nature, and it was his wont often to retire to a cave a few miles from Mecca, and there spend long vigils in prayer. He declared that here he had visions, in which the angel Gabriel appeared to him, and made to him revelations which he was commanded to make known to his fellow-men. The sum of the new faith which he was to teach was this: "There is but one God, and Mohammed is his Prophet." Mohammed communicated the nature of his visions to his wife, and she became his first convert. At the end of three years his disciples numbered forty persons. THE HEGIRA (622).--The teachings of Mohammed at last aroused the anger of a powerful party among the Koreishites, who feared that they, as the guardians of the national idols of the Caaba, would be compromised in the eyes of the other tribes by allowing such heresy to be openly taught by one of their number, and accordingly plots were formed against his life. Barely escaping assassination, he fled to the city of Medina. This Hegira, or Flight, as the word signifies, occurred in the year 622, and was considered by the Moslems as such an important event in the history of their religion that they adopted it as the beginning of a new era, and from it still continue to reckon their dates. THE FAITH EXTENDED BY THE SWORD.--His cause being warmly espoused by the inhabitants of Medina, Mohammed threw aside the character of an exhorter, and assumed that of a warrior. He declared it to be the will of God that the new faith should be spread by the sword. Accordingly, the year following the Hegira, he began to attack and plunder caravans. The flames of a sacred war were soon kindled. The reckless enthusiasm of his wild converts was intensified by the assurance of the Apostle that death met in fighting those who resisted the true faith ensured the martyr immediate entrance upon the joys of Paradise. Within ten years from the time of the assumption of the sword by Mohammed, Mecca had been conquered, and the new creed established among all the tribes of Arabia.