12km/7.5mi beyond Ferentino we reach the provincial capital, Frosinone (291m/960ft; pop. 46,000), picturesquely situated on a hillside above the Cosa valley, with remains of ancient buildings.
The town has a proud history of being opponents of Rome until 386 B.C. In medieval times the town was in the hands of the Byzantines and Lombards, but
was given to the church in 817.
Three main monuments in the city are the Church of Saint Benedetto, the Cathedral and the Church of Saint Lucia.
Musical events are popular here, and include a fall opera season.