 It is more likely that the wheel refers to Saint Martin, the patron of both the city itself and of Mainz Cathedral.Insignia dating from 1300 depict the saint with both wheels.Moreover, the Archbishops of Mainz were sometimes referred to as the "currum dei aurigantes" ("Drivers of God's Chariot") and the "currum ecclesiae Moguntinae aurigantes" ("Charioteers of the Church of Mainz"), to which the wheels may well also be a reference.