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.
[Footnote 63: Joseph.

de Bell.

Judaico, l.ii.c.16.The oration of Agrippa, or rather of the historian, is a fine picture of 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.