“The Green Knight is a late 14th-century Middle English chivalric romance. It is one of the best known Arthurian stories, with its plot combining two types of folklore motifs, the beheading game and the exchange of winnings.
It describes how Sir Gawain, a knight of King Arthur’s Round Table, accepts a challenge from a mysterious “Green Knight” who challenges any knight to strike him with his ax if he will take a return blow in a year and a day. Gawain accepts and beheads him with his blow, at which the Green Knight stands up, picks up his head and reminds Gawain of the appointed time. In his struggles to keep his bargain Gawain demonstrates chivalry and loyalty until his honour is called into question by a test involving Lady Bertilak, the lady of the Green Knight’s castle.”