On 7 July 1414, Filippo Maria Visconti, duke of Milan, brought the former Corte di Casale under the temporal jurisdiction of the Archbishop, and it ceased to be an autonomous authority. This happened with the consent of the men of Canzo, who swore fidelity to the legitimate Archbishop, Giovanni Visconti and provided him a refuge after he was forced to flee by a pretender to his office. Thus Canzo became the seat of the Archbishop and his court for at least five years.