Constantius was a 3rd-century Roman soldier of Egyptian origin who belonged to the legendary Theban Legion. Following the decimation of his unit, he escaped with several survivors to the Val Maira region. During this period, he and his companions preached the Christian faith and provided burials for their fallen comrades. According to tradition, his group was eventually pursued by Roman soldiers, who were reportedly turned to stone. Constantius was ultimately beheaded on Monte San Bernardo in 286.