Masters of the world, and wealthy beyond compute from its manifold spoils, the ancient Romans gave themselves up, in the later days of the Republic, to fashion, luxuriousness, and excesses of all kinds. The toil of the field--whether of battle or of agriculture--although it had conduced to make them hardy and healthy before their triumphs, had now become distasteful and odious. Their limbs, rendered effeminate by a new and fatal voluptuousness, grew at last unequal even to the weight of their arms, and they chose out the stoutest from among their slaves to serve as soldiers. The foreign people by whom they were surrounded failed not to note the advantage which time and change were preparing for them over their dissolute masters. They rose with Goth and Ostrogoth to free themselves from the heavy yoke. They fell upon the queenly city on all sides, and discrowned her of her imperial diadem. Such was the fate of that gigantic empire, which fell, as all powers ought to fall which are based on violence and injustice. One of the chief imported luxuries of the degenerate Romans were the thermæ, or baths, edifices upon which immense sums were lavished to make them beautiful and commodious in the extreme. Some were private, others public. The emperors vied with each other to render them celebrated and attractive. Caracalla, the unworthy son of Severus, and one of the very vilest of the line of Cæsars, built the vast pile which is still called by his evil name; the ruins of which forcibly illustrate the splendor of the past sovereignty, and the reasons of its swift decay. The greater number of these conspicuous and magnificent buildings in the city of Rome have subterranean passages attached to them, provided by their original possessors as a means of escape in times of danger, or to conceal the results of rapine or violence. In the subterranean passages connected with the Baths of Caracalla it was that the Three Hundred had agreed to meet, and as the darkness of night crept on, the outposts of the conspirators, like gliding shadows, planted themselves silently at the approaches to the wilderness of antique stones, from time to time challenging, in a whisper, other and more numerous shadows, which by-and-by converged to the spot. CHAPTER XX. THE TRAITOR The liberation of Manlio and the execution of the Cardinal gave an unexpected blow to the Pontifical Government, and aroused it from its previous easy lethargy. All the foreign and native soldiers available were put under arms, and the police were everywhere on the _qui vive_, arresting upon the slightest suspicion citizens of all classes, so that the prisons speedily became filled to overflowing.