Battle between Arthur and Mordred (15th Century), manuscript image from St. Alban's Chronicle at Lambeth Palace Library

This manuscript image relates to The Sword in the Stone because it showcases a joust. Preparing for the joust is what Sir Kay and Arthur are working on at the beginning of the tournament. There is a scene in the movie where Sir Kay is preparing for the joust with Wart and charges at the fake knight, which is operated by a mechanism controlled by Wart. Sir Kay flies over the castle walls as a result of not doing it properly.