Ferentium was a town of ancient
Etruria, situated near the modern city of
Viterbo in the northern part of the Roman province of
Latium, now in modern
Lazio. The city was also known as
Ferentinum,
Ferentum or
Ferentia, and should not be confused with ancient
Ferentinum (now
Ferentino), which is in southern Lazio.