As evidence of the passage of very ancient populations, the Catacombs of St. Ilario were found in Valmontone, on the hill at km 46 of Via Casilina, an ancient and important early Christian cemetery dating back to the end of the 4th century and the beginning of the 5th century.
The catacombs have a barrel vault and consist of six galleries and five passages, surmounted by wells.
According to the itinerant map of the Roman Empire, the Peutingerian table, here was the fourth and most important stopping point of the Via Labicana called "Ad Bivium", 44,250 km away from Rome. The station was close to the Sacco river, and offered abundant water for travelers and horses.
In the Roman period, a pagan village was formed around this station, which probably converted to the new religion at the beginning of the Christian era.
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