This career of conquest was interrupted by the great civil wars. The Arabs knew of nothing between entire liberty and absolute monarchy. The latter was the form which the caliphate first took, but it was universally assumed that the ruler was bound to abide strictly by the laws of religion. When Othman, grown old and feeble, was led by excessive nepotism and other causes into a breach of the latter, the result was a rebellion, in which he ultimately perished (656). The murder was followed by years of civil broils, and some decades later the whole thing was enacted afresh. The war was waged under religious pretexts, and to some extent from religious motives; but it was in the main a struggle for sovereignty between various members of the Koreish. Tribal animosities old and new were brought into play, and induced the tribes to throw in their lot with one or other of the leading parties. The outcome of the two great civil wars was that in each case the ablest man placed himself at the head of the empire; the first to do so, after the murder of Ali, Mohammed’s son-in-law, being the Omayyad Moawiya, son of Abu Sufyan, the leader of the heathen of Mecca against Mohammed. In his reign Damascus, where he had lived as governor for many years before, became the capital in place of Medina. The victor in the second instance was Abd al-Melik, of another branch of the Omayyad family. They were both men of great capacity but essentially worldly-minded. One of the prophet’s grandsons, a son of Ali, had made his peace, while another, Husain by name, fell in a foolish attempt at rebellion (680); though he was thenceforth regarded as a martyr, and much blood was shed to avenge his death on the rulers
The Arabs of that period knew how to conquer and to hold fast what they had won; for organisation they had less aptitude. Wherever they could they left administration, and taxation more especially, as they found it. At first the register of taxes was kept in Greek in the former dominions of Rome, and in Persian in those of Persia; and not until after more than half a century did the Arabic language become predominant in official book-keeping. The Omayyads had gained the mastery by the loyalty of the Arabs of Syria; they were tied to Syria, and the great tracts of territory to the east were hard to rule from thence. Moreover the Moslems of Babylonia, in many respects a more important province, were on the whole hostile to them. And, what was worse, the old lack of discipline among the Arabs had manifested itself strongly in a new form. Instead of small clans being at feud with one another, as had usually been the case in former days, they had ranged themselves in large and mutually hostile groups. One of these was composed of the Arabs of Yemen (real or reputed), two others of the tribes which claimed descent from Ishmael, the Mudhar and Rabia. If a caliph or a caliph’s vicegerent sided with the Yemen he had the Mudhar against him; if he favoured the Rabia the Mudhar were likewise hostile, etc. In the remoter provinces the hostile Arabs sometimes waged regular wars with one another on their own account. To add to this, there were risings of fanatics of various kinds. None but the ablest of the Omayyads (and on the whole they were an able dynasty) could maintain even tolerable order in the vast empire which extended its borders farther and farther when once the civil wars were over. The brief reign of a weakling or a libertine was enough to spoil everything. The purely Arab empire lacked the elements of stability.
Meanwhile, however, great masses of the conquered peoples had gone over to Islam. Temporal advantages on the one hand, and on the other the suitability of this coarse-grained religion to the Semites, and probably to the less educated Egyptians too, led steadily to the abandonment of a Christianity which in these parts was but little superior to Islam. But in Iran also the new religion soon made great advances on its own merits, though in some places (it must be admitted) very much at the expense of the purity of its pristine character. The national pride of the Arabs could not endure the practical application of the theoretical precept of Islam that all believers should be on an absolutely equal footing. The new converts remained Moslems of the second class, and, in certain districts at least, they felt the distinction bitterly. Even at the time of the second great civil war these so-called “clients” (