Sir Kay is a character from Arthurian legend, often depicted as the foster brother of King Arthur. He is known for his brash and boastful personality, which sometimes leads to conflicts with other knights. In many stories, Sir Kay serves as a knight of the Round Table, participating in various quests and adventures. Despite his flaws, he is loyal to Arthur and plays a significant role in the tales of the Knights of the Round Table. His character often embodies the themes of chivalry and honor found in medieval literature.