It was by such institutions that the nations of the empire insensibly melted away into the Roman name and people. But there still remained, in the centre of every province and of every family, an unhappy condition of men who endured the weight, without sharing the benefits, of society. In the free states of antiquity the domestic slaves were exposed to the wanton rigour of despotism. The perfect settlement of the Roman empire was preceded by ages of violence and rapine. The slaves consisted, for the most part, of barbarian captives, taken in thousands by the chance of war, purchased at a vile price, accustomed to a life of independence, and impatient to break and to revenge their fetters. Against such internal enemies, whose desperate insurrections had more than once reduced the republic to the brink of destruction, the most severe regulations and the most cruel treatment seemed almost justified by the great law of self-preservation. But when the principal nations of Europe, Asia, and Africa were united under the laws of one sovereign, the source of foreign supplies flowed with much less abundance, and the Romans were reduced to the milder but more tedious method of propagation. In their numerous families, and particularly in their country estates, they encouraged the marriage of their slaves. The sentiments of nature, the habits of education, and the possession of a dependent species of property, contributed to alleviate the hardships of servitude. The existence of a slave became an object of greater value, and though his happiness still depended on the temper and circumstances of the master, the humanity of the latter, instead of being restrained by fear, was encouraged by the sense of his own interest. The progress of manners was accelerated by the virtue or policy of the emperors; and by the edicts of Hadrian and the Antonines the protection of the laws was extended to the most abject part of mankind. The jurisdiction of life and death over the slaves, a power long exercised and often abused, was taken out of private hands, and reserved to the magistrates alone. The subterraneous prisons were abolished; and, upon a just complaint of intolerable treatment, the injured slave obtained either his deliverance or a less cruel master.

Hope, the best comfort of our imperfect condition, was not denied to the Roman slave; and, if he had any opportunity of making himself either useful or agreeable, he might very naturally expect that the diligence and fidelity of a few years would be rewarded with the inestimable gift of freedom. The benevolence of the master was so frequently prompted by the meaner suggestions of vanity and avarice, that the laws found it more necessary to restrain than to encourage a profuse and undistinguishing liberality, which might degenerate into a very dangerous abuse. It was a maxim of ancient jurisprudence, that a slave had not any country of his own; he acquired with his liberty an admission into the political society of which his patron was a member. The consequences of this maxim would have prostituted the privileges of the Roman city to a mean and promiscuous multitude. Some seasonable exceptions were therefore provided; and the honourable distinction was confined to such slaves only as, for just causes, and with the approbation of the magistrate, should receive a solemn and legal manumission. Even these chosen freedmen obtained no more than the private rights of citizens, and were rigorously excluded from civil or military honours. Whatever might be the merit or fortune of their sons, they likewise were esteemed unworthy of a seat in the senate; nor were the traces of a servile origin allowed to be completely obliterated till the third or fourth generation. Without destroying the distinction of ranks, a distant prospect of freedom and honours was presented, even to those whom pride and prejudice almost disdained to number among the human species.