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.
Historical accounts from the 10th century, which were written during a time of conflict due to Hungarian raids and Italian dukes' ambitions for the Kingdom of Italy, describe Cerro being fortified.