"Sir Gawain and the Green Knight" is a medieval poem that tells the story of Sir Gawain, a knight of the Round Table, who accepts a challenge from a mysterious figure known as the Green Knight. The Green Knight proposes a game where Gawain must strike him with an axe, but in return, he must seek out the Green Knight a year later to receive a blow in return. As Gawain embarks on his quest, he faces various trials that test his bravery, honor, and integrity. The poem explores themes of chivalry, loyalty, and the nature of true courage, ultimately highlighting the complexities of human character and the moral dilemmas faced by knights in the Arthurian legend.