During the struggles that saw the Serenissima and the Duchy of Milan opposing each other for the control of the Colle di Brianza between 1447 and 1450, the fortress of Airuno was the operative base of Francesco Sforza, who at the end of the conflict obtained the lordship over the country and granted privileges and exemptions to the inhabitants. Where the fortress once stood, now stands the Sanctuary of the Madonna.[4]