The Wheel of Time turns, and Ages come and pass, leaving memories that become legend. Legend fades to myth, and even myth is long forgotten when the Age that gave it birth comes again.
:P
Yeah, that's the one I couldn't think of! I was like... I know there's a sword in the stone reference. Derp. :lol
Both Gawain and Galad are Knights of the round table (well, Galad = Sir Galahad the Pure, Gawain is the guy from the story Sir Gawain and the Green Knight). Um, and the basic plot...
There's quite a bit of Arthurian legend in the book, actually. Just off the top of my head, the least obscure ones are:
Egwene Al'Vere = Guinevere
Tar Valon = Avalon
Artur Paendrag Tanreall (Hawkwing) = King Arthur Pendragon