Obtaining a precise sketch of Beauvais in Late Antiquity is currently a delicate mission. Indeed, the picture that can be proposed for the moment includes vague zones concerning the habitat and the public buildings. The only element that appears clearly is the rampart built at the earliest during the first quarter of the 4th century. However, despite extensive research on this monument, there are still unknowns, such as the location and number of gates or the existence of a ditch in front of the wall. The studies carried out show, however, that architecturally and chronologically it belongs to a movement of construction of defensive systems in urban areas that reshaped the cities and brought a new vision to them.