and by the aid of his disciples there, he was soon able to return to Mecca at the head of an armed force. This enabled him to subdue those who would not be convinced; and henceforward he proceeded to make proselytes and subjects together, till at length, being master of all Arabia and of Syria, his numerous followers saluted him king (627). This extraordinary man died suddenly, and in the midst of successes, at the age of sixty-one (632). Abubeker, his father-in-law and successor, united and published the books of the Koran, and continued and extended the empire which Mohammed had left him. A more powerful caliph (such was the title given to this series of monarchs) was Omar, the successor of Abubeker (635). Barbarity, ferocity, and superstition seem to have been mingled and to have reached their height in the person of Omar. It was by his order that the most magnificent library of antiquity, that of Alexandria, consisting of 700,000 volumes, was burned to ashes. The reason which he gave for this act is worth preserving:――‘If these writings,’ he said, ‘agree with the Koran, they are useless, and need not be preserved; if they disagree, they are pernicious, and ought to be destroyed.’ By himself and his generals this ferocious conqueror added Syria, Phœnicia, Mesopotamia, Chaldea, Egypt, Lybia, and Numidia, to his empire. Next came Otman, and then Ali, the son-in-law of Mohammed himself. The name of Ali is still revered by Mussulmans. His reign was short, but glorious. ‘After some internal troubles,’ says Hallam, ‘the Saracens won their way along the coast of Africa, as far as the pillars of Hercules, and a third province was irretrievably torn from the Greek empire. These Western conquests introduced them to fresh enemies, and ushered in more splendid successes. Encouraged by the disunion of the Visigoths [in Spain], and invited by treachery, Muza, the general of a master who sat beyond the opposite extremity of the Mediterranean Sea, passed over into Spain, and within about two years the name of Mohammed was invoked under the Pyrenees.’