Fermin was a third-century priest and bishop who served as a martyr for the Christian faith. Born in Pamplona, he was educated in Toulouse after being converted to Christianity by the followers of Saturninus. He eventually traveled to northern Gaul, where he became the bishop of Amiens. Following his preaching ministry, he was imprisoned and executed by local authorities in Amiens around 303. He is recognized as a hieromartyr and is traditionally honored as a co-patron of Navarre.