[1] Cassian succeeded Reticius as bishop, serving for about twenty years, and was well liked by the people of his see.
[1][2] After the peace bought by Constantine he had a vision and decided to embark with some companions to evangelize the Britons.
he pursued the evangelization of Éduens and held the office for twenty years of episcopate.
Gregory of Tours, who came to Autun two centuries after his death, said he saw a great veneration on his tomb.
The abbot of Saint-Quentin in Vermandois wishing to obtain the relics of the saint who was in great miracles made the request to Modon bishop of Autun.