It was once proposed to discriminate the slaves by a peculiar habit; but it was justly apprehended that there might be some danger in acquainting them with their own numbers. 53 Without interpreting, in their utmost strictness, the liberal appellations of legions and myriads, 54 we may venture to pronounce, that the proportion of slaves, who were valued as property, was more considerable than that of servants, who can be computed only as an expense. 55 The youths of a promising genius were instructed in the arts and sciences, and their price was ascertained by the degree of their skill and talents. 56 Almost every profession, either liberal 57 or mechanical, might be found in the household of an opulent senator. The ministers of pomp and sensuality were multiplied beyond the conception of modern luxury. 58 It was more for the interest of the merchant or manufacturer to purchase, than to hire his workmen; and in the country, slaves were employed as the cheapest and most laborious instruments of agriculture. To confirm the general observation, and to display the multitude of slaves, we might allege a variety of particular instances. It was discovered, on a very melancholy occasion, that four hundred slaves were maintained in a single palace of Rome. 59 The same number of four hundred belonged to an estate which an African widow, of a very private condition, resigned to her son, whilst she reserved for herself a much larger share of her property. 60 A freedman, under the name of Augustus, though his fortune had suffered great losses in the civil wars, left behind him three thousand six hundred yoke of oxen, two hundred and fifty thousand head of smaller cattle, and what was almost included in the description of cattle, four thousand one hundred and sixteen slaves. 61
The number of subjects who acknowledged the laws of Rome, of citizens, of provincials, and of slaves, cannot now be fixed with such a degree of accuracy, as the importance of the object would deserve. We are informed, that when the Emperor Claudius exercised the office of censor, he took an account of six millions nine hundred and forty-five thousand Roman citizens, who, with the proportion of women and children, must have amounted to about twenty millions of souls. The multitude of subjects of an inferior rank was uncertain and fluctuating. But, after weighing with attention every circumstance which could influence the balance, it seems probable that there existed, in the time of Claudius, about twice as many provincials as there were citizens, of either sex, and of every age; and that the slaves were at least equal in number to the free inhabitants of the Roman world. * The total amount of this imperfect calculation would rise to about one hundred and twenty millions of persons; a degree of population which possibly exceeds that of modern Europe, 62 and forms the most numerous society that has ever been united under the same system of government.
Domestic peace and union were the natural consequences of the moderate and comprehensive policy embraced by the Romans. If we turn our eyes towards the monarchies of Asia, we shall behold despotism in the centre, and weakness in the extremities; the collection of the revenue, or the administration of justice, enforced by the presence of an army; hostile barbarians established in the heart of the country, hereditary satraps usurping the dominion of the provinces, and subjects inclined to rebellion, though incapable of freedom. But the obedience of the Roman world was uniform, voluntary, and permanent. The vanquished nations, blended into one great people, resigned the hope, nay, even the wish, of resuming their independence, and scarcely considered their own existence as distinct from the existence of Rome. The established authority of the emperors pervaded without an effort the wide extent of their dominions, and was exercised with the same facility on the banks of the Thames, or of the Nile, as on those of the Tyber. The legions were destined to serve against the public enemy, and the civil magistrate seldom required the aid of a military force. 63 In this state of general security, the leisure, as well as opulence, both of the prince and people, were devoted to improve and to adorn the Roman empire.
Among the innumerable monuments of architecture constructed by the Romans, how many have escaped the notice of history, how few have resisted the ravages of time and barbarism! And yet, even the majestic ruins that are still scattered over Italy and the provinces, would be sufficient to prove that those countries were once the seat of a polite and powerful empire. Their greatness alone, or their beauty, might deserve our attention: but they are rendered more interesting, by two important circumstances, which connect the agreeable history of the arts with the more useful history of human manners. Many of those works were erected at private expense, and almost all were intended for public benefit.
It is natural to suppose that the greatest number, as well as the most considerable of the Roman edifices, were raised by the emperors, who possessed so unbounded a command both of men and money. Augustus was accustomed to boast that he had found his capital of brick, and that he had left it of marble. 64 The strict economy of Vespasian was the source of his magnificence. The works of Trajan bear the stamp of his genius. The public monuments with which Hadrian adorned every province of the empire, were executed not only by his orders, but under his immediate inspection. He was himself an artist; and he loved the arts, as they conduced to the glory of the monarch. They were encouraged by the Antonines, as they contributed to the happiness of the people. But if the emperors were the first, they were not the only architects of their dominions. Their example was universally imitated by their principal subjects, who were not afraid of declaring to the world that they had spirit to conceive, and wealth to accomplish, the noblest undertakings. Scarcely had the proud structure of the Coliseum been dedicated at Rome, before the edifices, of a smaller scale indeed, but of the same design and materials, were erected for the use, and at the expense, of the cities of Capua and Verona. 65 The inscription of the stupendous bridge of Alcantara attests that it was thrown over the Tagus by the contribution of a few Lusitanian communities. When Pliny was intrusted with the government of Bithynia and Pontus, provinces by no means the richest or most considerable of the empire, he found the cities within his jurisdiction striving with each other in every useful and ornamental work, that might deserve the curiosity of strangers, or the gratitude of their citizens. It was the duty of the proconsul to supply their deficiencies, to direct their taste, and sometimes to moderate their emulation. 66 The opulent senators of Rome and the provinces esteemed it an honor, and almost an obligation, to adorn the splendor of their age and country; and the influence of fashion very frequently supplied the want of taste or generosity. Among a crowd of these private benefactors, we may select Herodes Atticus, an Athenian citizen, who lived in the age of the Antonines. Whatever might be the motive of his conduct, his magnificence would have been worthy of the greatest kings.
The family of Herod, at least after it had been favored by fortune, was lineally descended