For ten points, name this knight of the Round Table who had an affair with Arthur's wife Guinevere.
This son of King Ban was known as the White Knight until he defeated the cowardly Copper Knight and lifted a stone slab to find his true name, after which Dolorous Guard became his castle Joyous Guard. This man killed Gaheris and Gareth as he rescued a lover from burning at the stake, which later earned him the enmity of their brother (*) Gawain. This man was raised by the Lady of the Lake, and his affair with Elaine of Corbenic produced the knight who eventually found the Holy Grail, Sir Galahad. For ten points, name this knight of the Round Table who had an affair with Arthur's wife Guinevere.
This son of King Ban was known as the White Knight until he defeated the cowardly Copper Knight and lifted a stone slab to find his true name, after which Dolorous Guard became his castle Joyous Guard.
Lancelot