Not far from the Janus Quadrifrons, and close to the Pons Æmilius, or Ponte Rotto, stands a small temple, now converted into the church of S. Maria Egiziaca, which presents an unsolved problem in Roman topography. The substruction of this temple, which has been laid bare, consists of tufa cased with travertine. The form of the temple is that called tetrastylos by Vitruvius, having four Ionic columns in front and seven at the sides. The four front columns and two on each side, forming the pronaos, originally stood clear, but are now enclosed within the wall of the church. The remaining five on each side with those at the back were half columns set against the wall of the cella. The shafts of the half columns are of tufa, but the bases and capitals, with the entablature and the columns of the pronaos, are of travertine. On the frieze and cornice are the remains of ornamental work, which is now rendered almost invisible by the stucco with which the walls have been covered. The Ionic volutes on the corner capitals of this temple are in the later style, while the side capitals are in the usual style. This building has usually been supposed to be the temple dedicated by Servius Tullius to Fortuna Virilis, and situated on the bank of the Tiber. The passage of Dionysius upon which this supposition rests is as follows: “Servius Tullius built two temples to Fortune, one in the Forum Boarium, and the other upon the bank of the Tiber.”[81] It is most probable, as Reber suggests, that we have here the Temple of Servius dedicated to Fortune without any special title. Dionysius, as we have seen, places this in the Forum Boarium, and Livy describes it as intra portam Carmentalem, and mentions it in tracing the course of a conflagration between the Salinæ near the Porta Trigemina and the Porta Carmentalis. But there was another temple, that of Mater Matuta which stood close to the Temple of Fortune, and there is no evidence showing to which of the two the ruin in question belonged. Both were founded by Servius, and reckoned among the most venerable relics of ancient Rome. Becker urges the claims of the Temple of Pudicitia Patricia, which Livy places in the Forum Boarium near the round Temple of Hercules, to this site. But this was merely a small shrine, containing a statue and not a templum. So far as an opinion can be formed of the date of the temple from the materials and style of architecture, it seems to belong to the later republic. [Sidenote: So-called Temple of Vesta.]