LE SYSTÈME DÉFENSIF (XIIIe-XVIe SIÈCLES, PHASE IX).

The article informs about the construction of the first defensive system following the leveling of the site and the development of the defensive structures with Urban Closure in the 13th and the 14th century. Topics include extramural elevation is homogeneous with the start of the construction of the masonry without noticeable difference in the mortar; and how the construction is organized of the curtain wall on the fillings of junction structure.