However, near the end of the 3rd century AD, the entered a new age of prosperity, and its northern part was just as prosperous, after it was integrated into Aquitaine. The Romans also had interests in the "Pays des Aulnes" and had started to clear the Forest of Argenson on its eastern border. During the 1st century AD they had built the Roman road connecting (Saintes) to (Angers) but it passed Aunis by, so clearings were opened into this vast forest, notably at Vouhé. Here remains of a Gallo-Roman villa have been restored, together with many fragmentary finds. At Saint-Georges-du-Bois, previously Argenton, the Romans built a small amphitheatre. In the 4th century AD the Romans decided to clear the Forest of Argenson along the southern shores of the Gulf of Pictones, which had been occupied by Celts since ancient times. The present Forest of Benon is in this area, where the Romans also established , whose names still linger on, such as that of the Gallo-Roman site in the commune of Saint-Ouen-d'Aunis., or the old – nowadays the commune of Nuaillé-d'Aunis, or indeed that of at Saint-Sauveur-d'Aunis. These attempts at deforestation and colonisation did succeed, albeit belatedly, but came to a halt with the invasions of the 5th century AD. So, the "barbarous" people sealed the fall of the western Roman Empire, with pillage and destruction from which Santonie did not escape. The province was then occupied by the Visigoths from the start of the 5th century AD, and then by the Franks, who took over after their victory in Vouillé in 507 AD. The "pagus alnensis" in the Middle Ages Aunis was once again neglected throughout the Middle Ages, "ignoring" the barbarians who had, after all, appropriated the great Roman roads during their invasions. From the time the Franks settled in the 6th century to the Carolingian dynasty in the 9th power in the province was unstable and autarchic. It was under Carolingian rule that Saintonge truly entered recorded history. Its name, , appears for the first time in 785. It was under the control of the Counts of Poitou. Towards the end of the 10th century, after Carolingian power collapsed, Aunis separated from Saintonge and had its first capital, Châtelaillon. In the 9th and 10th centuries the Counts of Poitou hastened to fortify the Aunis coast. They built the four-tower fortress at Châtelaillon as their stronghold to deal