Narnus was an early Christian bishop who served the community in Bergamo during the fourth century. Born in Ogna around 201, he is recognized as the first leader of the local church. While some traditions suggest he was consecrated by Saint Barnabas, historical accounts, such as those from the thirteenth-century friar Branca da Gandino, place his episcopate during the reign of Diocletian. He died in Bergamo in 345 and is honored as a saint within the Catholic tradition.