Sir Gawain and the Green Knight is a late 14th-century Middle English alliterative romance outlining an adventure of Sir Gawain, a knight of King Arthur's Round Table. In the tale, Sir Gawain accepts a challenge from a mysterious warrior who is completely green, from his clothes and hair to his beard and skin. The "Green Knight" offers to allow anyone to strike him with his axe if the challenger will take a return blow in a year and a day. Gawain accepts, and beheads him in one blow, only to have the Green Knight stand up, pick up his head, and remind Gawain to meet him at the appointed time. The story of Gawain's struggle to meet the appointment and his adventures along the way demonstrate the spirit of chivalry and loyalty.