Outside the town of Foligno, along the Corta di Colle, about a hundred meters from State Road 77, you come to the hill of S. Valentino di Civitavecchia. Few Foligno citizens know the area where it seems there used to be an ancient town or civitas with its place of worship in the early centuries of Christianity. The historian Ludovico Iacobilli speaks of a fortified village that developed in the third century following the martyrdom of the bishop of Terni Valentino, to whom the building was dedicated. In the 16th century, however, the entire complex must have been in a state of neglect because it is no longer mentioned in any texts.
In 1530 the noble Foligno family Cantagalli entrusted the custody to the Capuchin friars who abandoned the structure definitively in 1560, moving to the nearby hill of S. Giuseppe.
Today there are only a few remains of the perimeter walls of the entire monastery, and the remains of two columns; numerous fragments of Roman and Medieval inscriptions on stone found on the site are kept in the crypt of the St. Feliciano church.