From the first, Christianity had a philosophy of history. Its earliest apologists sought to show how the world had followed a divine plan in its long preparation for the life of Christ. From this central fact of all history, mankind should continue through war and suffering until the divine plan was completed at the judgment day. The fate of nations is in God's hands; history is the revelation of His wisdom and power. Whether He intervenes directly by miracle, or merely sets His laws in operation, He is master of men's fate. This idea, which has underlain all Christian philosophy of history, from the first apologists who prophesied the fall of the Empire and the coming of the millennium, down to our own day, received its classic statement in St Augustine's _City of God_. The terrestrial city, whose eternity had been the theme of pagan history, had just fallen before Alaric's Goths. Augustine's explanation of its fall passes in review not only the calamities of Roman history--combined with a pathetic perception of its greatness,--but carries the survey back to the origin of evil at the creation. Then over against this _civitas terrena_ he sets the divine city which is to be realized in Christendom. The Roman Empire,--the last general form of the earthly city,--gives way slowly to the heavenly. This is the main thread of Augustine's philosophy of history. The mathematical demonstration of its truth was left by Augustine for his disciple, Paulus Orosius. Orosius' _Seven Books of Histories against the Pagans_, written as a supplement to the _City of God_, is the first attempt at a Christian "World History." This manual for the middle ages arranged the rise and fall of empires with convincing exactness. The history of antiquity, according to it, begins with Ninus. His realm was overthrown by the Medes in the same year in which the history of Rome began. From the first year of Ninus' reign until the rebuilding of Babylon by Semiramis there were sixty-four years; the same between the first of Procas and the building of Rome. Eleven hundred and sixty-four years after each city was built, it was taken,--Babylon by Cyrus, Rome by Alaric, and Cyrus' conquest took place just when Rome began the Republic. But before Rome becomes a world empire, Macedon and Carthage intervene, guardians of Rome's youth (_tutor curatorque_). This scheme of the four world-monarchies, which was to prevail through all the middle ages, was developed through seven books filled with the story of war and suffering. As it was Orosius' aim to show that the world had improved since the coming of Christ, he used Trogus Pompeius' war history, written to exalt Roman triumphs, to show the reverse of victory,--disaster and ruin. Livy, Caesar, Tacitus and Suetonius were plundered for the story of horrors; until finally even the Goths in Spain shine by contrast with the pagan heroes; and through the confusion of the German invasions one may look forward to Christendom,--and its peace.