Between the 3rd and 2nd centuries B.C. Narce went through a slow decline. This is demonstrated by the few tombs dated in that period and by the definite abbandonment of the Sanctuary le Rote at the beginning of the 1st century B.C. Also the results of the excavations in the habitat of Monte li Santi confirm the crisis. Furthermore there is a notable decrease in the number of archeological finds as the conquest of the Agro Falisco by the Romans nears.
After the fall of the capital Falisca, Falerii, (today Civita Castellana) in 241 B.C. and the resulting control by Rome, very little material dated after those events has been found. It’s correct to imagine that the functions changed in the Imperial era and that the area became used mainly for sporadic agricultural activities.