“The increased prosperity ... infused into society soon displayed its effects; and the brilliant exploits of the reign of Justinian must be traced back to the reinvigoration of the body politic of the Roman Empire by Anastasius.”[72] Justinian inherited the throne from his uncle Justin, a Dardanian peasant, who could neither read nor write. But the barbarian shepherd was a thorough soldier, and the army he left behind him was probably not inferior to the legions of Titus or Trajan. At all events, had Justinian’s funds sufficed, there seems reason to suppose he might have restored the boundaries of the Empire. His difficulty lay not in lack of physical force, but in dearth of opulent enemies; in the sixth century conquest had ceased to be profitable. The territory open to invasion had been harried for generations, and hardly a country was to be found rich enough to repay the cost of a campaign by mercenaries. Therefore, the more the emperor extended his dominions, the more they languished; and finally to provide for wars, barbarian subsidies, and building, Justinian had to resort to over-taxation. With renewed want came renewed decay, and perhaps the completion of Saint Sophia, in 558, may be taken as the point whence the race which conceived this masterpiece hastened to its extinction. In the seventh century Asiatic competition devoured the Europeans in the Levant, as three hundred years before it had devoured the husbandmen of Italy; and this was a disease which isolation alone could cure. But isolation of the centre of exchanges was impossible, for the vital principle of an economic age is competition, and, when the relief afforded by the collapse of Rome had been exhausted, competition did its work with relentless rapidity. Under Heraclius (610–640) the population sank fast, and by 717 the western blood had run so low that an Asiatic dynasty reigned supreme. Everywhere Greeks and Romans vanished before Armenians and Slavs, and for years previous to the accession of Leo the Isaurian the great waste tracts where they once lived were systematically repeopled by a more enduring race. The colonists of Justinian II. furnished him an auxiliary army. At Justinian’s death in 711 the revolution had been completed; the population had been renovated, and Constantinople had become an Asiatic city.[73] The new aristocracy was Armenian, as strong an economic type as ever existed in western Asia; while the Slavic peasantry which underlay them were among the most enduring of mankind. There competition ended, for it could go no further; and, apparently, from the accession of Leo in 717, to the rise of Florence and Venice, three hundred and fifty years later, Byzantine society, in fixity, almost resembled the Chinese. Such movement as occurred, like Iconoclasm, came from the friction of the migrating races with the old population. As Texier has observed of architecture: “From the time of Justinian until