From the date of the death of Christ, the Christian religion made continual progress in the city and empire of Rome. Despite the contempt with which its believers were viewed, despite the persecution to which they were subjected, despite frequent massacres and martyrdoms, their numbers rapidly increased, and the many superstitions of the empire gradually gave way before the doctrines of human brotherhood, infinite love and mercy, and the eternal existence and happiness of those who believed in Christ and practised virtue. By the time of the accession of the great emperor Constantine, 306 A.D., the Christians were so numerous in the army and populace of the empire that they had to be dealt with more mercifully than of old, and their teachings were no longer confined to the lowly, but ascended to the level of the throne itself. The traditional story handed down to us is that Constantine, in his struggle with Maxentius for the empire of the West, saw in the sky, above the mid-day sun, a great luminous cross, marked with the words, "_In hoc signo vinces_" ("In this sign conquer"). The whole army beheld this amazing object; and during the following night Christ appeared to the emperor in a vision, and directed him to march against his enemies under the standard of the cross. Another writer claims that a whole army of divine warriors were seen descending from the sky, and flying to the aid of Constantine. [Illustration: ARCH OF TITUS, ROME.] It may be said that both these stories, though told by devout authors, greatly lack probability. But, whatever the cause, Constantine became a professed Christian, and as such availed himself of the enthusiastic support of the Christians of his army. By an edict issued at Milan, 313 A.D., he gave civil rights and toleration to the Christians throughout the empire, and not long afterwards proclaimed Christianity the religion of the state, though the pagan worship was still tolerated. This highly important act of Constantine was followed by another of great importance, the establishment of a new capital of the Roman empire, one which was destined to keep alive some shadow of that empire for many centuries after Rome itself had become the capital of a kingdom of barbarians. On the European bank of the Bosphorus, the channel which connects the Sea of Marmora with the Black Sea, had for ages stood the city of Byzantium, which played an important part in Grecian history. On the basis of this old city Constantine resolved to build a new one, worthy his greatness. The situation was much more central than that of Rome, and was admirably chosen for the government of an empire that extended as far to the east in Asia as to the west in Europe, while it was at once defended by nature against hostile attack and open to the benefits of commercial intercourse. This, then, was the site chosen for the new capital, and here the city of Constantinople arose.