At the time of the Roman arrival in the 1st century, Soule was inhabited by an Aquitani tribe named Suburates, who spoke the Aquitanian language (a form of Proto-Basque). As with other peoples in Aquitaine, the Romans had a somewhat important influence in the territory, although Soule kept its language and culture and was relatively unimportant during the times of the Roman Empire, due to its isolation. The only evidence of Roman influence in Soule exists in the chapelle of the Madeleine, in Tardets.