The stage was set for the appearance of a strong man. He came in the year 590 and his name was Gregory. He belonged to the ruling classes of ancient Rome, and he had been "prefect" or mayor of the city. Then he had become a monk and a bishop and finally, and much against his will, (for he wanted to be a missionary and preach Christianity to the heathen of England,) he had been dragged to the Church of Saint Peter to be made Pope. He ruled only fourteen years but when he died the Christian world of western Europe had officially recognised the bishops of Rome, the Popes, as the head of the entire church. This power, however, did not extend to the east. In Constantinople the Emperors continued the old custom which had recognised the successors of Augustus and Tiberius both as head of the government and as High Priest of the Established Religion. In the year 1453 the eastern Roman Empire was conquered by the Turks. Constantinople was taken, and Constantine Paleologue, the last Roman Emperor, was killed on the steps of the Church of the Holy Sophia. A few years before, Zoe, the daughter of his brother Thomas, had married Ivan III of Russia. In this way did the grand-dukes of Moscow fall heir to the traditions of Constantinople. The double-eagle of old Byzantium (reminiscent of the days when Rome had been divided into an eastern and a western part) became the coat of arms of modern Russia. The Tsar who had been merely the first of the Russian nobles, assumed the aloofness and the dignity of a Roman emperor before whom all subjects, both high and low, were inconsiderable slaves. The court was refashioned after the oriental pattern which the eastern Emperors had imported from Asia and from Egypt and which (so they flattered themselves) resembled the court of Alexander the Great. This strange inheritance which the dying Byzantine Empire bequeathed to an unsuspecting world continued to live with great vigour for six more centuries, amidst the vast plains of Russia. The last man to wear the crown with the double eagle of Constantinople, Tsar Nicholas, was murdered only the other day, so to speak. His body was thrown into a well. His son and his daughters were all killed. All his ancient rights and prerogatives were abolished, and the church was reduced to the position which it had held in Rome before the days of Constantine. The eastern church however fared very differently, as we shall see in the next chapter when the whole Christian world is going to be threatened with destruction by the rival creed of an Arab camel-driver. MOHAMMED AHMED, THE CAMEL-DRIVER, WHO BECAME THE PROPHET OF THE ARABIAN DESERT AND WHOSE FOLLOWERS ALMOST CONQUERED THE ENTIRE KNOWN WORLD FOR THE GREATER GLORY OF ALLAH, THE ONLY TRUE GOD