At the end of the third century the region under Rome’s rule organized itself into one province: Aquitania Tertia. It would be lined with roads listed in the Antonine Itinerary, which in the early fourth century retraced the Roman routes, symbols of an economic opening, e.g., the "coastal" path and the railway station of Segosa (Saint-Paul-le-Vieux). In Born and Marensin, the bays which had not yet been closed off by dunes obviously served as ports that permitted trade and commerce, such as that of resin collected in the ancient dune forests.