The Egyptians insist on the introduction of the worship of the Virgin Mary.—They are resisted by Nestor, the Patriarch of Constantinople, but eventually, through their influence with the emperor, cause Nestor's exile and the dispersion of his followers.

Prelude to the Southern Reformation.—The Persian attack; its moral effects.

The Arabian Reformation.—Mohammed is brought in contact with the Nestorians.—He adopts and extends their principles, rejecting the worship of the Virgin, the doctrine of the Trinity, and every thing in opposition to the unity of God.—He extinguishes idolatry in Arabia, by force, and prepares to make war on the Roman Empire.—His successors conquer Syria, Egypt, Asia Minor, North Africa, Spain, and invade France.

As the result of this conflict, the doctrine of the unity of God was established in the greater part of the Roman Empire.—The cultivation of science was restored, and Christendom lost many of her most illustrious capitals, as Alexandria, Carthage, and, above all, Jerusalem.