He was also noted for being an exorcist. Nicetius received the title of patriarch from the pope. He took it upon himself to judge secular as well as ecclesiastical cases and therefore came into conflict with the local count. Nicetius attended a council at his own city of Lyon some time between 567 and 570.
His feast day is April 2 the day on which he died. The church of Saint-Nizier in Lyon is dedicated to him. Miracles were attributed to him after his death. There is an early life of Nicetius and Gregory of Tours also wrote a supplementary life to him in his Vita Patrum.