Originally the Oppidum was the work of the Volcae Arecomici who started it in the fourth century BC. Nine square houses from the earliest period were recorded by Émile Marignan, these were roofed with branches and reeds. A rectangular house from the third century has been excavated. This contained both rough earthenware pottery for cooking and a finer black glazed table ware. During the first century BC, the hill was terraced and the houses became narrower similar to those found at Nages.