From the above description it will be seen that the architecture of the temple appears to belong to the end of the Republican era, but the inscription on the architecture gives us no further hint of the exact date, as the whole of it: with the exception of the words L. CELLIO. L. F., has disappeared. The most probable conjecture as to the deity to whom it was dedicated is that based upon the fact that Vesta was worshipped at Tibur, as is shown not only by two inscriptions found near the spot, but also by the mediæval name of this quarter of the town. The form of the temple also confirms such an opinion. [Sidenote: Temple of Albunea.] The second temple stands quite close to this round building, and is now consecrated as the Church of S. Giorgio. Its shape was that of a pseudoperipteral temple, i.e. with the side columns half sunk in the walls, raised on a meagre base of tufa blocks. It had a front, with four Ionic columns, one of which still remains, forming a support to the Campanile. An inscription dedicated to Drusilla, the sister of Caligula, was found here, but no reference as to the name of the temple can be drawn from it. A bas-relief, also found on the spot, represents the Tiburtine Sibyl sitting, and in the act of delivering an oracle. Hence it has been thought that we have in the Church of S. Giorgio the Temple of the Sibyl Albunea mentioned by Horace, Tibullus, and Lactantius, and this seems to be the most probable of the various conjectures which have been hazarded on the subject. The Grove of Tiburnus mentioned by Horace was probably on the right bank of the Anio, but further than this it is impossible to determine its exact position. There was also a grove dedicated to Diana. The Mons Catillus, now Monte Catillo or Monte della Croce, is the height on the right bank of the Anio. The name is at least as early as the time of Servius. [Sidenote: Villas.] As may easily be imagined there are numerous remains of ancient villas scattered about the immediate neighbourhood of Tibur, and the local guides, in order to please travellers but without the slightest evidence in support of their assertions, have dubbed them the Villas of Catullus, Horace, Ventidius, Quintilius Varus, Mæcenas, Sallust, Piso, Capito, Brutus, Popillius, and other celebrated Romans. The most remarkable ruins are those to which the name of Mæcenas has been attached. The greater part of these have been now unfortunately concealed by new buildings and by an iron manufactory, but a fine terrace and parts of the porticoes still remain on the lofty bank of the Anio. The rest is a mere confused mass of vaulted chambers and archways. The Via Tecta, or Porta Oscura, as it is sometimes called, by which the road passes underneath these ruins, was built, as we learn from an inscription now in the Vatican collection, by O. Vitulus and Rustius Flavos. The materials and style show that it can hardly be of a later date than the first century A.D. [Sidenote: Tempio della Tosse.]