 During the Iron Age, the site was used by the Ligures, who constructed an oppidum (a fortified village), and then by the Celts.The Romans built the Pont Flavien in the 1st century BC, a triumphal bridge which crosses the River Touloubre.Saint-Chamas owes its name to Sanctus Amantius (Saint Amans, by tradition the first bishop of Rodez), in whose honour a chapel was built in the 7th century.