The walls
The medieval city has 52 towers spread over a double enclosure measuring 3 km long. The interior wall includes parts of Gallo-Roman ramparts (III-IVth century) characterised by their small apparatus surmounted by brick cords. During the 13th century, the kings of France ordered the construction of a second outer enclosure around the City, supplemented by a dry ditch. The inner rampart was rebuilt for the most part in the last quarter of the 13th century, early 14th.