Water was brought to Rome by means of it from a spot near the Lake Regillus, and a portion is still visible on the left hand of the Via Labicana about two miles from Rome. The level of this aqueduct corresponds exactly with the building in question, and the style of brickwork and architecture are such as might belong to the third century. It is possible, as Reber remarks, that Alexander Severus may have found the exact spot where the Trophies of Marius had been placed by Julius Cæsar convenient for the castellum of his aqueduct, and have used the trophies to ornament the new building which he erected. [Sidenote: Arch of Gallienus.] Close to the Church of S. Vito, and spanning the Via di S. Vito, stands the Arch of Gallienus, erected by M. Aurelius Victor, prefect of Rome in A.D. 262, in honour of the Emperor Gallienus and Empress Salonina. It is constructed of travertine, and the ornamental work upon it is extremely simple, consisting only of pilasters crowned by roughly worked Corinthian capitals, and surmounted by an entablature of the commonest kind. Part of the basement is buried under the present level of the soil, and from a sketch by San Gallo of its state in the fifteenth century there appears to have been a pediment above the entablature, and two smaller archways on each side. The inscription, which is now hardly legible, is cut upon the architrave and contains a flattering description of one of the most singularly accomplished and incapable emperors of Rome, of whom Gibbon says, “Gallienus was a master of several curious but useless sciences, a ready orator and elegant poet, a skilful gardener, an excellent cook, and most contemptible prince.”[75] [Sidenote: Minerva Medica.] In the grounds of the Villa Magnani, which are reached from the Via di S. Bibiana, are two small Columbaria, one of which formerly contained inscriptions relating to the family of the Arruntii, and also one which belonged to Statilius Taurus, a nobleman mentioned by Tacitus. This was decorated with scenes from the Æneid of Virgil, but these are nearly destroyed. In the same gardens, not far to the north-west of the Porta Maggiore, stands a lofty and picturesque ruin, comprising a central decagonal hall surrounded by four other apartments, the ground-plan of which has been preserved by San Gallo. The central hall contained nine deep niches, and the entrance passes through the tenth side. Over the niches and the entrance archway are round-headed windows, and the roof was of vaulted brickwork. Traces still remain of stucco work and cement on the inner walls, from which it appears that they were covered with ornamental work and in some parts with marble.