Since Romulus, with a small band of shepherds and outlaws, fortified himself on the hills near the Tyber, ten centuries had already elapsed. During the four first ages, the Romans, in the laborious school of poverty, had acquired the virtues of war and government: by the vigorous exertion of those virtues, and by the assistance of fortune, they had obtained, in the course of the three succeeding centuries, an absolute empire over many countries of Europe, Asia, and Africa. The last three hundred years had been consumed in apparent prosperity and internal decline. The nation of soldiers, magistrates, and legislators, who composed the thirty-five tribes of the Roman people, were dissolved into the common mass of mankind, and confounded with the millions of servile provincials, who had received the name, without adopting the spirit, of Romans. A mercenary army, levied among the subjects and barbarians of the frontier, was the only order of men who preserved and abused their independence. By their tumultuary election, a Syrian, a Goth, or an Arab, was exalted to the throne of Rome, and invested with despotic power over the conquests and over the country of the Scipios. The limits of the Roman empire still extended from the Western Ocean to the Tigris, and from Mount Atlas to the Rhine and the Danube. To the undiscerning eye of the vulgar, Philip appeared a monarch no less powerful than Hadrian or Augustus had formerly been. The form was still the same, but the animating health and vigor were fled. The industry of the people was discouraged and exhausted by a long series of oppression. The discipline of the legions, which alone, after the extinction of every other virtue, had propped the greatness of the state, was corrupted by the ambition, or relaxed by the weakness, of the emperors. The strength of the frontiers, which had always consisted in arms rather than in fortifications, was insensibly undermined; and the fairest provinces were left exposed to the rapaciousness or ambition of the barbarians, who soon discovered the decline of the Roman empire. Chapter VIII: State Of Persia And Restoration Of The Monarchy.—Part I. Of The State Of Persia After The Restoration Of The Monarchy By Artaxerxes.