"Sir, you are welcome in this place; I am the head of this court. They call me Arthur. Get down from your horse, I beg you, and join us for dinner, And then whatever you seek we will gladly see to" (ln 34-37).
The Green Knight enters King Arthur's Dining Court with nothing but an axe
"No, so help me God on high, My errand is hardly to sit at my ease in your castle!" (ln 38-39). But since I've heard so much good about you and your castle, I can assure you I mean no harm. I would like to ask you to play a game with me however. I will let one person take a blow to my neck with my axe.
"I beseech you, Sire, let this game be mine" (ln 123-124).
Sir Gawain accepts the Green Knight's game on behalf of the King
Sir Gawain strikes the Green Knight in the neck and his head comes clean off
The Green Knight picks up his head and continues to challenge Sir Gawain
"Come to the Green Chapel, I charge you, and take A stroke the same as you've given, for well you deserve To be readily requited on New Year's morn." (ln 182- 184).
The Green Knight storms off for Gawain to meet again a year and one day later
"The King and Gawain there Laugh at the thing and grin; And yet, it was an affair Most marvelous to men" (ln 194-197).