It is in the west point of the Campus Martius that Nero’s Bridge and the Ælius bridge link the banks of the Tiber. It’s also at this place that the connection is made between the Via Recta, which crosses the Campus Martius from east to west, and the Via Tecta which crosses the west side from the Ælius bridge towards the theatres of Pompey and Marcellus, passing under the Arch of Gratian, Valentinian and Theodosius. At last, the west side is crossed by Agrippa'a Euripe.

Crossing the Porta Triomphalis, then the Arch of Arcadius, Theodosius and Honorius, , we come to the part called Tarentum, where stood two great temples built on a terrace. Left the Temple of Dis Pater (Roman equivalent of god Pluto) and right the Temple of Prosperina. Prosperina is the name given by the Romans to Persephona whom they assimilated with the old Italic goddess Libera. They consider her mainly as the queen of infernal world, spouse of Pluto. Her cult was introduced into Rome in 249, by order of the Sybillan Books. Prosperina shared with her husband Pluto a common altar, Ara Ditis et Prosperinæ that you can notice at the bottom of the steps, facing the two temples. It’s on this place that the Tarentinian Games were celebrated. These two imposing temples made surely a great impression.

Quite close to the temple of Prosperina, the House of Julius Martialis, tribune in 69 AD.

Going further down the Via Tecta, we cross on our right the Trigarium. This wide space which has the shape of a circus, was used only for the training of running chariots. Besides, next to the Trigarium were the stables of the great factions who ran for fame in the Circus Maximus of Rome.

After having left the Trigarium, and the stables of the faction of the Whites behind us, we come to the huge l'immense shipyards ( Navalia ) that were alongside the Tiber, and were used to dock and repair many ships navigating on the river. This old military dockyard housed the long quinqueremes of the Roman fleet. The Aurelian wall has been slightly bent inwards to offer a better space for the activities of the harbour.