The Quest of the Holy Grail
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Composed by an unknown author in early thirteenth-century France, The Quest of the Holy Grail is a fusion of Arthurian legend and Christian symbolism, reinterpreting ancient Celtic myth as a profound spiritual fable. It recounts the quest of the knights of Camelot as they journey through danger and temptation to reach the elusive Holy Grail. But only one of them is judged worthy to see the mysteries within the sacred vessel and look upon the ineffable. Enfused with tragic grandeur and an aura of mysticism, The Quest is an absorbing and radiant allegory of man's perilous search for divine grace, and it had a profound influence on later Arthurian romances and versions of the Grail legend.
There is a 1969 translation which is widely available on Penguin:
https://a.co/d/01W9s0Hn
A modern translation by Judith Shoaf is out there with a dense introduction, but this version is a little hard to source and runs close to $30:
https://a.co/d/0aB2mwnP