With the death of Marcus Aurelius individual competition may be judged to have done its work, and presently, as the population changed its character under the stress thereof, a new phase opened: a phase which is marked, as such phases usually are, by victory in war. Marcus Aurelius died in 180 A.D. Substantially a century later, in 312, Constantine won the battle of the Milvian Bridge with his troops fighting under the Labarum, a standard bearing a cross with the device “_In hoc signo vinces_”; By this sign conquer. Probably Constantine had himself scanty faith in the Labarum, but he speculated upon it as a means to arouse enthusiasm in his men. It served his purpose, and finding the step he had taken on the whole satisfactory, he followed it up by accepting baptism in 337 A.D. From this time forward the theory of the possibility of securing divine or supernatural aid by various forms of incantation or prayer gained steadily in power for about eight centuries, until at length it became a passion and gave birth to a school of optimism, the most overwhelming and the most brilliant which the world has ever known and which evolved an age whose end we still await. The Germans of the fourth century were a very simple race, who comprehended little of natural laws, and who therefore referred phenomena they did not understand to supernatural intervention. This intervention could only be controlled by priests, and thus the invasions caused a rapid rise in the influence of the sacred class. The power of every ecclesiastical organization has always rested on the miracle, and the clergy have always proved their divine commission as did Moses. This was eminently the case with the mediæval Church. At the outset Christianity was socialistic, and its spread among the poor was apparently caused by the pressure of servile competition; for the sect only became of enough importance to be persecuted under Nero, contemporaneously with the first signs of distress which appeared through the debasement of the denarius. But socialism was only a passing phase, and disappeared as the money value of the miracle rose, and brought wealth to the Church. Under the Emperor Decius, about 250, the magistrates thought the Christians opulent enough to use gold and silver vessels in their service, and by the fourth century the supernatural so possessed the popular mind that Constantine, as we have seen, not only allowed himself to be converted by a miracle, but used enchantment as an engine of war. The action of the Milvian Bridge, fought in 312, by which Constantine established himself at Rome, was probably the point whence nature began to discriminate decisively against the vested interest of Western Europe. Capital had already abandoned Italy; Christianity was soon after officially recognized, and during the next century the priest began to rank with the soldier as a force in war.