The pauldron is a significant advancement in the evolution of plate defense, emerging from the earlier and simpler 'spaudler' to provide comprehensive coverage of the shoulder joint and the vulnerable axilla (armpit). Unlike the spaudler, which sat primarily atop the shoulder, the pauldron extends forward across the breastplate and backward over the backplate. This overlap necessitated sophisticated articulation via sliding rivets and internal leather straps, allowing the noble wearer to retain mobility during the chaos of a melée while maintaining an impenetrable facade.
In the context of English chivalry and heraldry, the pauldron served as a prestigious canvas for artisan steelwork. By the late 15th century, pauldrons were frequently asymmetrical; the left shoulder (the 'main-de-fer') was often reinforced or enlarged to sustain the impact of an opponent's lance during a tilt, while the right was cut away to allow for easier couching of the wearer's own weapon. In funerary hatchments and effigies of the Tudor period, the meticulous depiction of these plates served as an enduring testament to the subject's knightly service and feudal obligations to the Crown.