
AS Lu, Directorate then Commissioner of Water and Roads 717, n. 205
The sixteenth-century curtain wall is today punctuated by eleven bastions of different shapes and sizes, distributed irregularly along the perimeter: denser in the southern area, more spaced in the northern area, which bear witness to the complex construction of the walls, which lasted 150 years.
This plan of the walls was drawn by the engineer Alessandro Resta on 28 February 1569 and highlights the interventions that had already been carried out to the north and south.
To the north, the oldest bastion, the "Platform," dedicated to San Frediano, stands out for its small size. The platform protrudes only slightly from the line of the walls and is directly attached to the medieval curtain wall, still clearly visible today because it is made of stone.
To the south, the Santa Maria bastion, the only Renaissance bastion with square sides, was designed and built by Alessandro Resta together with the two adjacent curtain walls and the Porta San Pietro.
View of the San Frediano platform and the medieval stone wall

















The old San Donato gate with the remains of the drawbridge and the medieval walls
One of the two remaining lunettes in the stands area






