The opinion that it was the Temple of Spes Vetus, which Frontinus places near the commencement of the branch aqueduct of Nero, is more likely to be correct, but the shape of the building, so far as it is at present known, does not agree with such a supposition. The ruins are commonly known by the name of the Temple of Venus and Cupid, a name which was given to them from the discovery of a statue near them representing a female figure. But it is a fatal objection to this that the name of the Roman matron (Sallustia) whose statue was supposed to be that of Venus, has been discovered to be engraved upon the pedestal. The statue may be seen in the Museo Pio Clementino.
Amphitheatrum Castrense.
On the other side of the Basilica, and forming a part of the Aurelian wall, is a portion of an amphitheatre. The interior, now used as a garden, may be seen by entering the door on the right hand of the basilica. The larger axis of the amphitheatre was apparently about one hundred and ten yards, and the shorter eighty-five or thereabouts. It is entirely constructed of brick, even to the Corinthian capitals which ornament the exterior, and the workmanship shows it to belong to the best age of Roman architectural art. The second tier of arches has almost entirely disappeared, and of the lowest tier only those are left which are built into the city wall. But to suppose, as Becker does, that it was not an amphitheatre, but the vivarium, where the wild beasts used in the games were kept, seems out of the question. The only difficulty is to determine what the special history and purpose of the building, manifestly an amphitheatre, placed so far from the populous parts of the city, was. The Notitia here comes to our aid, for it records the existence of an amphitheatrum castrense in the fifth region; and there can be little doubt that we have here the remains of the amphitheatre built for the entertainment of the prætorian troops quartered in a fortified camp beyond the Porta S. Lorenzo. Aurelian made use of the outer side of the building as a part of his walls, and it is most probable that when Constantine pulled down the inner portion of the prætorian camp, he also destroyed the greater part of this amphitheatre.
House of the Laterani.
In consequence of the sinking of part of the wall which supports the apse of the Basilica of St. John Lateran, excavations became necessary in the year 1876 which disclosed the foundations of some ancient buildings between the baptistery and the Via della Ferratella, and of some others under the apse itself. These were carefully examined, and it became evident that they belonged to the extended ruins of a large villa, probably that called the House of the Laterani, which was occupied and enlarged by the emperors of the second and third centuries, and finally given by Constantine to the Bishop of Rome. The House of Verus, also mentioned by Julius Capitolinus, was probably on this site.
Claudian Aqueduct.
Not far from the Sessorium, and springing out of the angle of the wall close to the Porta Maggiore, a series of lofty arches begins which extends throughout the whole length of the Cælian Hill. This is a branch aqueduct of the Aqua Claudia, built by Nero to supply the Cælian and Aventine Hills at a higher level than the Aqua Marcia and Aqua Julia, on which they had previously depended for their supply. It passed over the road leading from the Porta Maggiore to the Basilica of S. Croce, and thence ran along the higher ground through the vineyards of the Scala Santa, whence it skirted the Via di S. Stefano, and, at the Arch of Dolabella, was divided into three branches, one of which crossed the valley to the Palatine, the second ran towards the edge of the hill over the Coliseum, and a third towards the Porta Capena.
Arch of Dolabella.
The arch of Dolabella stands a little to the north-west of the Piazza della Navicella, and spans the road leading down from thence into the valley between the Cælian and Palatine, formerly called the Clivus Scauri. The archway consists of a single arch of travertine, without any ornamentation, but carrying an inscription to the effect that Publius Cornelius Dolabella, when consul, and Caius Julius Silanus, when Flamen Martialis, erected the arch by order of the Senate. The consulship of this Dolabella falls in the reign of Augustus A.D. 10, and therefore the arch can originally have had no connection with the Neronian aqueduct. It is possible, however, as Becker and Reber suggest, that the arch may have been originally built to carry the Aqua Marcia and Julia, which, as we know from Frontinus, supplied the Cælian before the building of the Neronian branch of the Aqua Claudia.[121] On one side the Arch of Dolabella is still completely hidden by the brickwork of the Neronian arches, and the other side was probably covered in a similar manner until after 1670, as we find no mention of this arch in Donatus, who could not have omitted to notice it in his description of the Neronian aqueduct had it been visible in his time.
Navicella.