The Temptation of Sir Gawain:
Sir Gawain and the Green Knight exists in one unique manuscript. Here, you see Gawain trying to resist the temptations
of the lovely "Lady":

(BL, Cotton MS Nero A. x, f. 129)
The Green Knight--Without His Head:
In the same manuscript, the scene of the Green Knight riding out of Arthur's hall, head in hand, was another scene chosen for illustration:
