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The first document in the archives of the Abbey of Farfa tells of the medieval village of 948. By 1081 a bull of Gregory VII says that the ‘castellum in Nazanum’ is under the control of the Roman monastery of St. Paul Outside the Walls, and thus reports directly to the Papal State. In the Middle Ages the two abbeys of Farfa (loyal to the Emperor) and Sao Paolo (loyal to the Pope) had their own separate territory from the river Tiber.

After a period under the control of the Savelli family, from the late fifteenth century Nazzano finally came back under the control of the monks that fortify the castle.