empire was governed by absolute power, under the guidance of
virtue and wisdom. The armies were restrained by the firm but gentle
hand of four successive emperors, whose characters and authority
commanded involuntary respect. The forms of the civil administration
were carefully preserved by Nerva, Trajan, Hadrian, and the Antonines,
who delighted in the image of liberty, and were pleased with considering
themselves as the accountable ministers of the laws. Such princes
deserved the honor of restoring the republic, had the Romans of their
days been capable of enjoying a rational freedom.

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, [50] and the timid, inhuman Domi