The Green Knight is a figure from medieval literature who represents nature and the natural world. In the story, he challenges King Arthur and his knights to a game in which they must strike him with a sword. The Green Knight is immune to all weapons, and Arthur's knights are unable to harm him. However, the Green Knight is eventually defeated by Arthur's wife, Queen Guinevere, who uses a magic sword. The story is a commentary on the relationship between humans and nature, and the natural world's ability to resist the destruction wrought by humans.