The chronicles that refer to the events of the 10th century, a period in which for defense reasons, linked to the frequent raids of the Hungarians and the reprisals of the dukes aspiring to the Kingdom of Italy, many of the villages were set up, report that Cerro was fortified.
The chronicles from the 10th century, focused on defense against Hungarian attacks and retaliatory actions by ambitious Italian rulers, led to the fortification of Cerro.