>>41434986
>The story describes howSir Gawain, who was not yet a knight ofKing Arthur'sRound Table, accepts a challenge from a mysterious "Green Knight" who dares any man to strike him with his axe if he will take a return blow in a year and a day. Gawain accepts and beheads him, after which the Green Knight stands, picks up his head, and reminds Gawain of the appointed time. In his struggles to keep his bargain, Gawain demonstrateschivalryandloyaltyuntil his honour is called into question by a test involving the lord and the lady of the castle at which he is a guest.

https://en.wikipedia.org/wiki/Sir_Gawain_and_the_Green_Knight