Had Pope Severinus at this moment failed in his duty, the whole Church would have been involved in the Monothelite heresy. Not only Pope Severinus, but his successors during forty years, were the sole stay of the Church against a heresy—the last root of the condemned Eutychean heresy—which overthrew the true doctrine of the Incarnation, making our Lord Jesus Christ not God and Man in one Person, but a Person compounded out of God and Man, and therefore not Man at all. The whole temporal power of the Byzantine sovereign, at that time despotic lord of Rome, and backed by subservient patriarchs, Sergius, Pyrrhus, Paulus, and Peter, was exerted to compel the Popes who sat during these forty years to accept the false doctrine presented to them in an imperial decree.(21) The successive Popes in this time, Severinus, John IV., Theodore I., St. Martin I., St. Eugenius I., St. Vitalian, Deusdedit, Donus I., rejected and condemned the decision urged upon them by the imperial and patriarchal pressure, all of them at the risk of every sort of persecution—one, St. Martin, at the cost of a singularly painful and glorious martyrdom. The next Pope, St. Agatho, condemned the heresy in a General Council allowed at Constantinople itself by an orthodox emperor over which his legates presided. The Pope succeeding him, St. Leo II. ratified the condemnation by the Council of four successive Byzantine patriarchs, Sergius, Pyrrhus, Paulus and Peter, as heretics, and censured the negligence of Honorius in not extinguishing at once so dangerous a flame. In truth it had held the life of the Church in suspense during more than forty years. Had one of the ten successors of Honorius failed, all would have been lost, so near to the precipice was the Byzantine despotism and the State patriarchate, subservient to it, and supplying it obediently with theological knowledge sufficient to formulate heresy, allowed by the Divine Providence in that fearful century to drive the Church. And precisely during these years the new Arabian conqueror—the chalif of Mohammed—cut in two the empire which was attempting this parricide. When Heraclius went forth committing his city and his son to God, to the holy Mother of God, and to his bishop, he triumphed for the only time in the long Roman history over Rome’s eastern rival, and brought back the Cross from Persia to Constantinople, and then carried it in dutiful homage to be replaced in its old shrine where our Lord suffered at Jerusalem. When at the bidding of that very bishop Sergius he tampered with the Christian faith, and oppressed the successor of St. Peter, he lost Jerusalem, Alexandria, and Antioch, with the great provinces which belonged to them. Out of the four patriarchates of his empire, three became subject to the Mohammedan chalif. The subjection came suddenly, but has lasted with a short interval from that time to this. The conquest, as yet unbroken, of Mohammed over Christian peoples dates from the perfidy of