The labors of these monarchs were overpaid by the immense reward that inseparably waited on their success; by the honest pride of virtue, and by the exquisite delight of beholding the general happiness of which they were the authors. A just but melancholy reflection imbittered, however, the noblest of human enjoyments. They must often have recollected the instability of a happiness which depended on the character of single man. The fatal moment was perhaps approaching, when some licentious youth, or some jealous tyrant, would abuse, to the destruction, that absolute power, which they had exerted for the benefit of their people. The ideal restraints of the senate and the laws might serve to display the virtues, but could never correct the vices, of the emperor. The military force was a blind and irresistible instrument of oppression; and the corruption of Roman manners would always supply flatterers eager to applaud, and ministers prepared to serve, the fear or the avarice, the lust or the cruelty, of their master. These gloomy apprehensions had been already justified by the experience of the Romans. The annals of the emperors exhibit a strong and various picture of human nature, which we should vainly seek among the mixed and doubtful characters of modern history. In the conduct of those monarchs we may trace the utmost lines of vice and virtue; the most exalted perfection, and the meanest degeneracy of our own species. The golden age of Trajan and the Antonines had been preceded by an age of iron. It is almost superfluous to enumerate the unworthy successors of Augustus. Their unparalleled vices, and the splendid theatre on which they were acted, have saved them from oblivion. The dark, unrelenting Tiberius, the furious Caligula, the feeble Claudius, the profligate and cruel Nero, the beastly Vitellius, and the timid, inhuman Domitian, are condemned to everlasting infamy. During fourscore years (excepting only the short and doubtful respite of Vespasian’s reign) Rome groaned beneath an unremitting tyranny, which exterminated the ancient families of the republic, and was fatal to almost every virtue and every talent that arose in that unhappy period. Under the reign of these monsters, the slavery of the Romans was accompanied with two peculiar circumstances, the one occasioned by their former liberty, the other by their extensive conquests, which rendered their condition more completely wretched than that of the victims of tyranny in any other age or country. From these causes were derived, 1. The exquisite sensibility of the sufferers; and, 2. The impossibility of escaping from the hand of the oppressor.