Nazarius was baptized by the blessed Pope Linus. He went into Gaul, and there baptized a child named Celsus whom he had instructed in the Christian doctrine. Together they went to Treves, and in Nero’s persecution were both thrown into the sea, but were saved by a miracle. They proceeded to Milan, where they spread the faith of Christ; and as they with great constancy confessed Christ to be God, the prefect, Anolinus, condemned them to death. Their bodies were buried outside the Roman gate, and for a long time remained unknown. But through a divine revelation they were found by St. Ambrose, sprinkled with fresh blood, as if they had but just suffered martyrdom. They were translated to the city and buried in an honorable tomb.
Excerpted from The Liturgical Year, Abbot Gueranger O.S.B.