single river near Bevagna. Their courses are by now highly artificial, the result of land and water management projects undertaken over many centuries, since they are recorded at least as early as the time of Theodoric the Great (6th century) and have continued down to our own time with the construction of dams and works to regularize the seasonal waters of the Marroggia that had been subject to frequent torrential overflows with sudden and disastrous results. The most important of the year-round watercourses is the Clitunno River, celebrated in antiquity as the Clitumnus, whose deified waters were reputed to have miraculous properties and which have been lauded in prose and verse by Pliny the Younger, Propertius, Claudian, Addison, Byron and Carducci. Trevi borders the following municipalities: Campello sul Clitunno, Castel Ritaldi, Foligno, Montefalco, Sellano, Spoleto. History In Antiquity, Pliny the Elder mentioned Trevi as a city of the ancient Umbrians, which has been confirmed by the find of an Umbrian inscription within the territory of the comune, at Bovara, in the 1950s. 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: among them Roman baths that appear to have been still more or less in use in the time of St. Francis, who is known to have visited the area and to have advised people to bathe there. In antiquity Trevi is said to have had jurisdiction over much of the valley below, all the way to the Monti Martani that form the central backbone of Umbria. The seat of a bishop until the 11th century, Trevi was a Lombard gastaldate, then, in the early 13th century, freed itself of outside rulership to become a free commune. It generally allied itself with Perugia in order to defend itself from nearby Spoleto, and fought several wars with other neighboring communes, with varying outcomes, including invasion by Spoleto in the 14th century and a brief