During the period of the Santons of Independence
Pons quickly became an active center of crafts and trade and developed its exchanges with the Romans.
However, the abandonment of the castrum after the second half of the first century of the Christian era sounded the death knell of the Gallo-Roman city which, in the course of the third century, experienced a devastating fire during the invasion of the Alamans.
After a hurried reconstruction, it knew a short period of peace narrated by the poet Ausone but with the 5th century arise new barbarian invasions even more destructive, in particular those committed by the Vandals in the autumn 408 where the city disappears during long centuries.
However, the revival of the small city will take place at the beginning of the Middle Ages thanks to the rise of Christianity in Saintonge.
At the turn of the 12th century, Pons became a strongly fortified "city" where its keep, one of the most imposing of all the Saintonge, made it one of the safest cities of the region.
Ideally situated on the road to Santiago de Compostela, it became an active religious centre with churches, monastic orders and even a hospital for pilgrims.