After this battle the eastern army divided into two divisions. One marched northward to the Caspian Sea and took possession of the neighboring countries; another, southward to Persepolis, from whence the king of Persia fled for his life across the drearv deserts of Khorassan. The name of Saracen terrified the wild tribes of independent Tartary, and they hastened to pay tribute and accept the faith of their conquerors.

The emperor of China, in his palace at Peking, heard of their exploits, and sent ambassadors to them, craving their friendship. The kingdoms now included in Afghanistan and Beloochistan surrendered at their approach, and the Mahometan standard of the crescent waved on the banks of the Indus.

Meanwhile important events were transpiring in the west. A large proportion of the Egyptian people welcomed the Saracens. The Arabs of the desert loitered in the palaces of the ancient Pharaohs. Alexandria, aided by Roman troops, alone held out. After a siege of fourteen months it also fell, and with it Egypt and Abyssinia were added to the dominions of the Caliphs.

The most powerful religious empire that the world has ever seen had suddenly sprung into existence. It stretched from the Great Wall of China to the burning sands of Tripoli, and from the Caspian Sea on the north to Abyssinia on the south. Yet this was but little more than half the territory that it soon afterwards controlled. One of its armies advanced on Constantinople. It did not fall then, but afterwards became the capital of the Mahometan power in Europe. Another took possession of the whole north of Africa, and, having consolidated its power there, under the command of their general, Tarik, they crossed the straits that separate Africa from Spain, and landing on the rocky clift of Gib-el-Tarik, or mountain of Tarik (now called Gibraltar), unfurled their green banner with golden crescent for the first time on the soil of Europe.

Tarik was soon followed into Spain by his superior officer, the emir Musa. They took possession of the whole southern portion of Spain and Portugal, which in their own picturesque language, they named Andalusia, or the region of the evening.

It was soon found that the whole peninsula was ripe for revolution. The Jews comprised a large proportion of the Spanish people. They were, to a great extent, the cultivators of the soil, which pursuit well repaid their labors. They were then, as now, famous as merchants and money-lenders, and many of them held high positions in the government, while thousands of them were scattered in every city, town and village, as the physicians and teachers of the people.

Their wrongs had been accumulating for centuries. Bigotry, envy and avarice had conspired to point them out as objects of persecution. Laws were passed which were never intended to be executed. It was expected that they would purchase a remission of the penalties by pouring their hard-earned treasures into the lap of Rome. No doubt the Jews exulted as the tide of Saracen conquest swept onward. They did not deplore a change of masters for those who would leave them in possession of civil and religious liberty.

Before long the whole Iberian peninsula fell into the hands of the Mahometans. Not content with this, they crossed the Pyrenees, and took possession of that portion of France that lies to the south of the river Loire. All Central France was overrun. Castles, churches and monasteries were despoiled. For a time they held undisturbed dominion. The empire of the Saracens was then at its greatest extent. It reached from the confines of China to the Atlantic ocean, and comprised within its limits forty degrees of latitude and nearly one hundred and twenty of longitude. In Western Europe alone it stretched in an unbroken line more than a thousand miles northward from the cliffs of Gibraltar. More than thirty-six thousand cities paid tribute to the successors of Mahomet in the city of Medina.

In attempting to extend their conquests northward the Saracens were met by an army under Charles Martel, king of France, A. D. 732. Between Tours and Poictiers a terrible battle was fought, which lasted seven days. The Franks and Goths lost so many that it was impossible to tell the number of the slain. But these losses were more than counterbalanced by the losses of the Saracens whose great general, Abderahman, was found among the slain. Their previous successes had filled them with pride. They looked with contempt upon their enemies. For example, when the Roman emperor, Nicephorous, had sent a threatening letter to the Caliph Haroun-al-Raschid, the latter replied, "In the name of the most merciful God, Haroun-al-Raschid, commander of the faithful, to Nicephorous, the Roman dog! I have read thy letter, O thou son of an unbelieving mother! Thou shalt not hear my words; thou shalt behold my reply!" A few weeks later it was written in letters of blood on the plains of Phrygia.

Although the Saracen empire had reached the zenith of its power, in one sense Mahometanism had not reached its culmination. The day was to come, when under the name of Ottoman Turks, it would expel the descendants of the Caesars from their capital, hold the classic land of Greece in subjection, and under the very walls of Vienna dispute the empire of Europe in the center of that continent; and in Africa extend its dogmas and faith across burning deserts and pestilential forests far south of the equinoctial line.