The doctrines of Mohammedanism, or Islam, which means "submission," are contained in the Koran, the sacred book of the Moslems. They declare that God has revealed himself through four holy men: to Moses he gave the Pentateuch; to David, the Psalms; to Jesus, the Gospels; and to Mohammed, the last and greatest of all the prophets, he gave the Koran.

"There is no God save Allah," is the fundamental doctrine of Islamism, and to this is added the equally binding declaration that "Mohammed is the Prophet of Allah." The faithful Moslem must also believe in the sacredness and infallibility of the Koran. He is also required to believe in the resurrection and the day of judgment, and an after-state of happiness and of misery. Also he must believe in the absoluteness of the decrees of God,—that he foreordains whatsoever comes to pass, and that nothing man can do can change his appointments.

The Koran, while requiring assent to the foregoing creed, inculcates the practice of four virtues. The first is prayer; five times each day must the believer turn his face towards Mecca and engage in devotion. The second requirement is almsgiving. The third is keeping the Fast of Ramadan, which lasts a whole month. The fourth duty is making a pilgrimage to Mecca.

ABUBEKR, FIRST SUCCESSOR OF MOHAMMED (632-634).—Upon the death of Mohammed a dispute at once arose as to his successor; for the Prophet left no children, nor had he designated upon whom his mantle should fall. Abubekr, the Apostle's father-in-law, was at last chosen to the position, with the title of Caliph, or Vicar, of the Prophet, although many thought that the place belonged to Ali, the Prophet's cousin and son-in-law, and one of his first and most faithful companions. This question of succession was destined at a later period to divide the Mohammedan world into two sects, animated by the most bitter and lasting hostility towards each other. [Footnote: The Mohammedans of Persia, who are known as Shiites, are the leaders of the party of Ali; while the Turks, known as Sunnites, are the chief adherents of the opposite party.]

During the first part of his caliphate, Abubekr was engaged in suppressing revolts in different parts of the peninsula. These commotions quieted, he was free to carry out the last injunction of the Prophet to his followers, which enjoined them to spread his doctrines by the sword, till all men had confessed the creed of Islam, or consented to pay tribute to the Faithful.

THE CONQUEST OF SYRIA.—The country which Abubekr resolved first to reduce was Syria. A call addressed to all the Faithful throughout Arabia was responded to with the greatest alacrity and enthusiasm. From every quarter the warriors flocked to Medina, until the desert about the city was literally covered with their black tents, and crowded with men and horses and camels. After invoking the blessing of God upon the hosts, Abubekr sent them forward upon their holy mission.

Heraclius made a brave effort to defend the holy places against the fanatical warriors of the desert, but all in vain. His armies were cut to pieces. Seeing there was no hope of saving Jerusalem, he removed from that city to Constantinople the True Cross, which he had rescued from the Persians (see p. 390). "Farewell, Syria," were his words, as he turned from the consecrated land which he saw must be given up to the followers of the False Prophet.

THE CONQUEST OF PERSIA (632-641).—While one Saracen army was overrunning Syria, another was busy with the subjugation of Persia. Enervated as this country was through luxury, and weakened by her long wars with the Eastern emperors, she could offer but feeble resistance to the terrible energy of the Saracens.

Soon after the conquest of Persia, the Arabs crossed the mountains that wall Persia on the north, and spread their faith among the Turanian tribes of Central Asia. Among the most formidable of the clans that adopted the new religion were the Turks. Their conversion was an event of the greatest significance, for it was their swords that were destined to uphold and to spread the creed of Mohammed when the fiery zeal of his own countrymen should abate, and their arms lose the dreaded power which religious fanaticism had for a moment imparted to them.

THE CONQUEST OF EGYPT (638).—The reduction of Persia was not yet fully accomplished, when the Caliph Omar, the successor of Abubekr, commissioned Amrou, the chief whose valor had won many of the cities of Palestine, to carry the standard of the Prophet into the Valley of the Nile. Alexandria, after holding out against the arms of the Saracens for more than a year, was at length abandoned to the enemy. Amrou, in communicating the intelligence of the important event to Omar, wrote him also about the great Alexandrian Library, and asked him what he should do with the books. Omar is said to have replied: "If these books agree with the Koran, they are useless; if they disagree, they are pernicious: in either case they ought to be destroyed." Accordingly the books were distributed among the four thousand baths of the capital, and served to feed their fires for six months.