سقوط الإمبراطورية الرومانية الغربية
Riom was inhabited during the Roman era, from the 1st century through the 4th. During this time, it was a mansio or way-station along the Julier Pass road. After the Fall of the Western Roman Empire, farmers and herders continued to live here during the Early Middle Ages. In 840 it was personally owned by the king of Raetia Curiensis and a local administrative center.