Cassius of Clermont was a Roman senator during the third century who became a Christian following his conversion by Austromoine. While living in Roman Gaul, he was executed alongside several companions, including Victorinus, Maximus, Anatolius, and Linguinus. Their deaths occurred during an invasion of the region by Chrocas, a chieftain of the Alemanni. Because of his faith, he is recognized as a martyr in various Christian traditions.