Saint Narnus is venerated as the first
bishop of Bergamo.
Christian tradition holds that he was consecrated during the
Apostolic Age in his office by
St. Barnabas, although Narnus probably lived later than that. The oldest source that mentions Narnus dates from the 13th century; it was written by Branca da Gandino, a
friar. He considers Narnus a bishop of Bergamo during the reign of
Diocletian in the fourth century.