The Dusay Bulwark is a military architectural testimony built between the late fifteenth and early sixteenth centuries in the Saint Pancrazio area, in transition between the Middle Ages and the modern age. The space Saint Pancrazio was born as Dusay Bulwark for the defence of the north face of the Castle. In Europe, around the middle of the fifteenth century, the advent of fire guns began a process of adaptation and modernization of military defences of medieval origin. The architectures that characterized that historical period were defined as transitional, but, in fact, they represent a precise response to the needs that emerged from the conditions of war, in any case transitory.