Gawain is a central figure for Spicer with regards to the composition of The Holy Grail. Explaining the composition of the poem in June 1965, he says,
I'd started out with a couple of poems which were obviously about Gawain, who sort of interested me as a character, mainly from Gawain and the Green Knight, nothing else. And then they started growing, and finally there was apoem which seemed to stop everything, and I thought, "oh gee, good, I got a Gawain poem." [...] Unfortunatly, the night after that there came a new poem which was obviously about Percival. This annoyed me terribly. (54)
From The House that Jack Built: The Collected Lectures of Jack Spicer. Edited by Peter Gizzi.