 Once they took possession of the place, the Romans, in order to consolidate the dominion over the Etruscans and to monitor the navigation on Tiber, founded on these hills a "castrum", identified with the name of "Castrum Amerinum" (it's believed to be the actual "Palazzolo" of Vasanello), according to a topographic map realized by the Mattei family in the second half of the seventeenth century.The site was recovered between the ninth and tenth centuries when, under the threat of the Hungarians, it took importance again for the easily defensible location thanks to its proximity to the "Via Amerina", an old Roman road still in use at that time.The name of Bassano in Teverina appears for the first time in the eleventh century.