 These guardians, whose only duty originally was the protection of the diocese, enlarged their jurisdiction at the expense of the diocesan rights and even filled the episcopal see with members of their families.Wearisome quarrels resulted, during which the city of Lausanne, with the aid of Berne and Fribourg, acquired new rights, and gradually freed itself from episcopal suzerainty.When Bishop Sebastian de Montfaucon (1517–60) took sides with the Duke of Savoy in a battle against Berne, the Bernese used this as a pretext to seize the city of Lausanne.