The heater shield or heater-shaped shield is a form of European medieval shield, developing from the early medieval kite shield in ca. the mid 13th century.
The term is a neologism, created by Victorian antiquarians due to the shape's resemblance to a clothes iron.
Smaller than the kite shield, it was more manageable and could be used either mounted or on foot.[1] From the 15th century, it evolved into highly specialized jousting shields, often a bouche containing a notch or "mouth" for the lance to pass through. As plate armor began to cover more and more of the body, the shield grew correspondingly smaller, until by the mid 14th century, it was hardly seen at all outside of the tournament. Heater shields were typically made from thin wood overlaid with leather. Some shields, such as that of Edward, the Black Prince from his tomb in Canterbury Cathedral, incorporated additional layers of gesso, canvas, and/or parchment. [2]