"Sir Gawain and the Green Knight" is a 14th-century Middle English poem that tells the story of Sir Gawain, a knight of the Round Table. The tale begins during a New Year's feast at King Arthur's court when a mysterious figure, the Green Knight, challenges the knights to a game. Gawain accepts the challenge, leading to a quest that tests his bravery, honor, and integrity. As Gawain embarks on his journey, he faces various trials, including a stay at the castle of Lord Bertilak. The story explores themes of chivalry, loyalty, and the nature of honor, culminating in Gawain's encounter with the Green Knight, which reveals deeper truths about his character.