An aerial view of the Fortress-oppidum of Paule, of the Osismii tribe in Armorica around 50 BCE at the time of the Roman conquest of Gaul. It is located in modern Saint Symphorien and it was one of the strongest fortresses of the tribe,

possibly controling and maintaining its Atlantic trade (Credit/copyright:The Gauls: overview of their architecture).
Below, in the map of Armorica (modern Bretagne in France): the terittory of the Osismii tribe with Paule  located almost at the center of it.