Saint Proculus is the military patron of Bologna. In the time of the Diocletian, one Marinus was sent to Bologna to enforce the emperor's edict. Incensed by Marinus' cruelty, Proculus went to Marinus' house and killed him with an axe. The Bolognese have held Proculus in veneration from very ancient times. His remains are preserved in the church of San Procolo in Bologna.