The area has been inhabited for approximately 1,000 years. It is probable that initially it did not have a defined city structure. During the Roman conquest, the fertility of the area guaranteed food production for Rome.
The earliest record of Onna is in 1178 during the time of Pope Clement III, in Villa Unda. Onna is mentioned again by Pope Innocent III in 1204. Aside from these two records, the early history of the area is a mystery. There existed a “grancia” (a type of agricultural company detached from the convent) run by the Cistercian monks.
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