Imposing as the architectural appearance of the Roman theatre was, magnificently and suitably as it was planned, it could never attain great national, and consequently historical, importance, because tragedy was never popular and comedy never political. The warlike and bloody scenes presented by the mortal combats of gladiators and wild beasts had a far greater attraction for a people who, by nature, felt more reverence for Mars than for the Muses. It was long, however, before these exhibitions were provided with especial arenas. After the introduction of the gladiatorial contests by Marcus and Decius Brutus, in 264 B.C., upon the occasion of funeral games, the prisoners of war had fought together upon the Forum; and the slaughter of powerful animals, inaugurated under Metellus by the killing of elephants taken from the Carthaginians in 252 B.C., and continued under Æmilius Paullus by the sacrifice of deserters to beasts of prey, had taken place in the Circus. But this could not have been well suited to the purpose, as its limited width was impeded by the spina, and its side barriers could not have offered sufficient protection to the spectators from the desperate attempts of the infuriated animals to escape. As early as 59 B.C., Caius Curio had surprised the Roman people with two wooden theatres, built back to back, and arranged so as to turn bodily upon their axes after the conclusion of the scenic performances, so that the two auditories faced one another, and left between them an arena for the succeeding combats of gladiators. It is not certain whether this was the original of the amphitheatre, or whether the oval plan arose from simply giving broader proportions to that form of stadion, like the one at Aphrodisias in Caria, which was terminated by a semicircle at each end. But it is scarcely to be doubted that the wooden Theatrum Venatorium of Cæsar had the disposition which was repeated, with but few alterations, in the stone amphitheatre of Statilius Taurus, built during the reign of Augustus, and in those of wood erected by Augustus, Tiberius, and Nero. By the time of the Flavians it was recognized that no gift was so acceptable to the Roman populace as the provision of a magnificent place fitted for these inhuman games, and thus arose that most gigantic edifice of all ages—the Colosseum. (Figs. 282 and 283.) Even provincial towns like Reggio, Pompeii, Herculaneum, Albanum, Tusculum, Sutri, Pola, Verona, Nismes, Treves, Constantine, etc., were provided with edifices of this kind, fully as important in proportion to the number of their inhabitants.
The mausoleums and monuments erected in honor of prominent citizens constitute an important class in the architectural history of Rome. In early times a tumulus form, similar to that of the Etruscan tombs, seems to have predominated. The older monuments in the vicinity of Rome were thus constructed. A tumulus, the lower cylinder of which appears to have been elevated upon a square substructure decorated with Tuscan pilasters, may be assumed to have existed above the remarkable sepulchral labyrinth of the Scipios, outside the Porta Appia, and within the present Porta S. Sebastiano. In course of time the circular drum of masonry increased, while the original cone was diminished to a pointed roof; the magnificent tombs of Cæcilia Metella, the wife of Crassus, and of the Plautii upon the Via Appia and Via Tiburtina, show it as already preponderating. The tumulus of Augustus upon the Via Flaminia, at present within the Porta del Popolo, displays a cylinder of 24 m. in diameter, decorated by thirteen niches once provided with statues; while the cone of earth above, which was archaistic agreeably to the affectation of Augustus, was planted with cyprus-trees and terminated by a colossal image of the imperial builder. Even more gigantic was the mausoleum built by Hadrian, the lower portion of which now forms the substructure of the Castle of S. Angelo. It was once surmounted by a second smaller cylinder bearing a conical roof. When the area at disposal was too limited for the adoption of so extended a base, the monument rose, like a tower, to a great height, in successive stories of decreasing dimensions, with or without columns, as in the fine example of St. Remy in Southern France. The endless rows of tombs upon the Via Appia vary from simple piers and subterranean burial-chambers (called columbaria, from the thousands of niches for funeral urns resembling the nests of doves) to colossal mausoleums. The remains of bulwarks prove that many of these elevations were utilized for mediæval fortresses. Even foreign forms were employed; the so-called Tomb of the Horatii at Albano resembles that of Porsena, while the Egyptian pyramid is reproduced in the mausoleum of C. Cestius near the Porta di S. Paolo. The conformation of the land presented but little opportunity for the execution of rock-cut tombs with a front carved in the cliff; but one remarkable example has been preserved upon the Lake of Albano, called, from the twelve fasces introduced in its decoration, the Tomb of the Consuls. In the mountainous provinces of the East these sepulchres were more common, as, for instance, in Petra, where numbers of façades hewn in the rock, with a kind of decorative temple-like architecture, betray magnificence rather than good taste. (Fig. 284.)
