bishop and martyr. He was probably a missionary bishop who died at Amiens, over whose tomb a later bishop of Amiens, St Firmin the confessor, built the church now called St Acheul. The martyrologies and the liturgical books of the 10th–11th centuries from different places mention one or the other Firmin of Amiens, but on different dates: Firmin the martyr on 25 September; Firmin the confessor on 1 September. Firmin the martyr is titular of two ancient English churches.
AA.SS. Sept. VII (1760), 24–57 and Propylaeum, p. 415; B.L.S., viii. 176; for Firmin the Confessor, AA.SS. Sept. I (1746), 175–99;J. Corblet, Hagiographie du diocèse d'Amiens (1870), ii. 31–216.