Fermin (also Firmin, from Latin Firminus; Spanish Fermín) was a holy man and martyr, traditionally venerated as the co-patron saint of Navarre, Spain.

Firmus's son, Firminus (Fermin), was entrusted to Honestus for his Christian education and at age 31 went to Toulouse to be consecrated by Saturninus's successor, Honoratus.

He was martyred (traditionally in 257 AD), significantly by being tied to a bull by his feet and dragged to his death,[4] a martyrdom that is sometimes transferred to Fermin.

Though the 11th century Basilica of Saint-Sernin, the largest surviving Romanesque structure in France, has superseded it, the church is said to be built where the bull stopped.

In Legenda aurea several miracles attended the discovery and translation of the relics of Saint Fermin in the time of Salvius, bishop of Amiens (traditionally ca 600).

According to the legend, a sweet odor arose from his grave, which caused ice and snow to melt, flowers to grow, the sick to be cured, and trees to be inclined reverently toward the saint.

The veneration of Saint Fermin was of great religious and economic importance to Amiens during the Middle Ages and into modern times.

The existence of a monastery named after a Saint Firmin in North Crawley was recorded in the Domesday Book (i.149a); there was a holy well in the churchyard,[10] and unauthorized pilgrimages there were suppressed in 1298.

The fiestas are celebrated in honor of Fermin, co-patron saint of Navarra, although the religious aspect would seem to have taken on a secondary role over the last number of years.

The funeral monument of Adrien de Henencourt, head of the chapter of Amiens Cathedral in the early 16th century, depicts not only the life and martyrdom of the saint, but also the posthumous history of his body, in a series of polychrome reliefs and statuary.