Summary

George Grazebrook The Dates of Variously-shaped Shields…

Nor can we suppose that one scale of size, or indeed one exact shape of shield, reigned universal at any one period; every knight had his own fancies as to which best suited him; and at length we find many illuminations of the sixteenth century in which knights appear jousting and fighting without any shields at all. They were hung up, to show the heraldry, on their tents, and the massive body-armour alone was considered sufficient protection.
Source: Gutenberg

George Grazebrook The Dates of Variously-shaped Shields…

While on this subject of suits of mail, I may with advantage overstep the limits of this century—as, indeed, I have already done—and mention that such went on increasing so greatly in protective perfectness, and, pari passu, in their oppressive weight, that a knight falling off the horse upon which he had been placed lay perfectly helpless; and history records many times that they were slain by clowns and boys while lying helpless on [26] the ground. When the style of protective armour became so exaggerated, a man so hampered could do little more than hold his spear and guide his horse.
Source: Gutenberg

George Grazebrook The Dates of Variously-shaped Shields…

I notice as quite remarkable how many ladies who had come to represent a manor, about the middle of the thirteenth century, when the fashion was at its height, at once beautified or safeguarded their seals with a secretum.
After 1301 such extra sealing almost disappears, but there are some very late instances. Humfrey Earl of Stafford and Perche, 1438, placed on the back of his splendid seal a smaller one—the Stafford arms on a heater shield, within a decoration of three Stafford knots, but without any inscription (Archæologia, vol. xxxviii)
Source: Gutenberg

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