 "Treviae" is also mentioned in the 5th‑century Bordeaux Itinerary.After the earliest period, the history of which is essentially unknown, but to which the walls in the core hill portion of the town attest, dated to the 1st century BC, the first stage of the development of Trevi beyond the hill took place under the Empire, when Hadrian restored the main road through the territory, the Via Flaminia, thus spurring the growth of a suburb in the plain at the place now called Pietrarossa, where sporadic excavations over several centuries have brought to light many remains