The Holy Martyrs Celsius, Nazarius, Gervasius, and Protasius of Milan suffered during the reign of the emperor Nero (54-68). Saint Nazarius (son of the Christian Perpetua and the Jew Africanus) was born at Rome and was baptized by Bishop Linus. From his youthful years Nazarius decided to devote his life to preaching Christ and to aid wandering Christians. With this intent he left Rome and arrived in Mediolanum (Milan).
While visiting Christians at the Mediolanum prison, Nazarius made the acquaintance of the twins Protasius and Gervasius. The twin brothers had been born in the city of Mediolanum into a family of rich Roman citizens, Vitalius and Valeria. When they received his inheritance from his parents,they distributed their money to the poor, freed their slaves, and occupied themselves with fasting and prayer. The pagans locked them up in prison for their confession of faith in Christ. Saint Nazarius so loved the twins that he wanted to suffer and die with them. The ruler heard that he was visiting the prisoners, so he had Saint Nazarius beaten with rods, then driven from the city.
Saint Nazarius proceeded to Gaul (modern France), and there he successfully preached Christianity and converted many pagans. In the city of Kimel he baptized Celsius, the son of a certain Christian woman who entrusted her child to the saint. Nazarius raised the boy in piety, and acquired a faithful disciple and coworker in his missionary labors.
The pagans threw the saints to wild animals to be eaten, but the beasts would not touch them. Afterwards, they tried to drown the martyrs in the sea, but they walked upon the water as if on dry land. The soldiers who carried out the orders were so amazed that they themselves accepted Christianity and released the holy martyrs.
Saints Nazarius and Celsius went to Milan and visited Gervasius and Protasius in prison. For this, they were brought before Nero, who ordered that Saints Nazarius and Celsius be beheaded. Soon after this the holy brothers Gervasius and Protasius were also executed. The relics of all four martyrs were stolen by a Christian named Philip, and were buried in his house.
Many years later, during the reign of the holy Emperor Theodosius (408-450), Saint Ambrose, Bishop of Milan (December 7), discovered the relics of Saints Gervasius and Protasius through a revelation from God.
In the reign of Arcadius and Honorius, Saint Ambrose also discovered the relics of Saints Nazarius and Celsius. The holy relics, glorified by many healings, were solemnly transferred to the Milan cathedral.