Saint Firmin, son of a Roman senator, was a native of Pamplona. With his father and the rest of the family, he was taught the Christian faith and baptized by Honestus, a disciple of Saint Saturninus, the bishop of Toulouse, himself the disciple of Saint Peter the Apostle.
St. Firmin, having been entrusted to Honestus for his education by his father, left Pamplona and accompanied him on his apostolic journeys. He was ordained and eventually consecrated bishop himself and received the mission to preach the Gospel in the remoter parts of Gaul. TAccording to tradition he preached in the regions of Agen, Angers, Beauvais, and what is now Clement-Ferrand.
Returning to Amiens, he established his residence there and founded a large church of faithful disciples. Amiens conserves the memory of the day he arrived and preached fearlessly there beside a temple of Jupiter, at a site where now the Basilica of Our Lady stands. Many conver-sions followed, even among the authorities of the city, including the senator. He continued his preaching in that region for a number of years, literally emptying the pagan temples of worshippers. And then two Roman officials, Longulus and Sebastian, heard of him and came to the city.