At the accession of Gregory II. the whole coast line from Cilicia at least to Mauritania on the Atlantic, had been lost to the Roman empire, and in a very great degree to the Christian Church as well. It was all now in the occupation of a single power, the head of which was termed the successor. The successor that is of the Arabian who had set himself in the place of Christ, who had conquered the Christians in this vast range of territory, and would allow them to live only on tenure of subjection. Instead of the remnant of primeval tradition which formed the mythology and influenced the customs of the northern tribes at the time of their descent on the western empire, the Arabian prophet and his successors had impregnated their people with a furious and fanatical belief to be imposed by force. It was a chief part of that belief that it ought to be imposed by force on all outside. And they who fell in such a holy war were held to be martyrs, as indeed they witnessed and imitated the life of Mohammed from the time of the Hegira. Thus the possession of the world was attached to the profession of one God and Mohammed as his prophet. In the century next after the death of the prophet those who retrace the deeds of his followers must admit that every possible disregard of human life and of the things most hallowed in Christian society had been shown by them in the construction of a kingdom now stretching from the Atlantic to the Indus. The religion under whose inspiration all this had been done, was framed in essential antagonism to the Christian faith. For indeed the mystery on which the Christian faith rested, that the Son of God had assumed human nature for the redemption of man, was denounced by it as derogatory to the very conception of God. Mohammedans proscribed Christians as associators of a creature with the Creator. This association they called idolatry. The northern wandering of the nations might receive Christian belief and be formed into a Christendom. The southern wandering of the nations, since it rested on a prophet the personal antagonist of the Christian founder, could only substitute Islamieh for Christendom. This it had done over the empire which as we have seen was constructed at the time St. Gregory II. became Pope, and Leo III. after six revolutions became emperor at Constantinople.