From the beginning:"The institutions of Imperial Rome had long thwarted, the great law of man's existence which impels him to better his condition, when the accession of Leo the Isaurian to the throne of Constantinople suddenly opened a new era in the history of the Eastern Empire. Both the material and intellectual progress of society had open deliberately opposed by the imperial legislation. A spirit of conservatism persuaded the legislators of the Roman empire that its power could not decline, if each order and profession of its citizens was fixed irrevocably in the sphere of their own peculiar duties by hereditary succession. An attempt was really made to divide the population into castes. But the political laws which were adopted to maintain mankind in a state of stationary prosperity by these trammels, depopulated and impoverished the empire, and threatened to dissolve the very elements of society. The Western Empire, under their operation, fell a prey to small tribes of northern nations; the Eastern was so depopulated that it was placed on the eve of being repeopled by Slavonian colonists, and conquered by Saracen invaders.Leo III mounted the throne, and under his government the empire not only ceased to decline, but even began to regain much of its early vigour. Reformed modifications of the old Roman authority developed new energy in the empire. Great political reforms, and still greater changes in the condition of the people, mark the eighth century as an epoch of transition in Roman history, though the improved condition of the mass of the population is in some degree concealed by the prominence given to the disputes concerning image-worship in the records of this period. But the increased strength of the empire, and the energy infused into the administration, are forcibly displayed by the fact, that the Byzantine armies began from this time to oppose a firm barrier to the progress of the invaders of the empire.When Leo III was proclaimed Emperor, it seemed as if no human power could save Constantinople from falling as Rome had fallen. The Saracens considered the sovereignty of every land, in which any remains of Roman civilization survived, as within their grasp. Leo, an Isaurian, and an Iconoclast, consequently a foreigner and a heretic, ascended the throne of Constantine, and arrested the victorious career of the Mohammedans. He then reorganized the whole administration so completely in accordance with the new exigencies of Eastern society, that the reformed empire outlived for many centuries every government contemporary with its establishment."