Roman administration. Christianity spread during this phase. Eubodio is given as the first bishop of Tifernum.

Early Middle Ages

The city suffered devastation during Gothic incursions and, although not entirely destroyed, appears to have changed its name to Castrum Felicitatis.

Between the late 6th century and early 7th century the diocese expanded widely, extending to the right bank of the Tiber up to Pieve Santo Stefano