Its history is identified with that of its castle, built in the Middle Ages around a watchtower from which comes the noun tower. According to some, the origin of the name would derive from the Latin ad fines, which would indicate its location on the borders (fines) of the plateau with respect to the territory of Orvieto which dominated it, while according to others the appellative of the name would be added for Identify it with the geographic location on the plateau of the same name and to distinguish it from the nearby tower of San Severo.
There is no news that the area was inhabited in the Etruscan age and not even in the Roman, although the proximity to the Etruscan settlement of Velzna.
https://it.wikipedia.org/wiki/Torre_Alfina