quality:corruption, linguistic:paraphrasing
Lancelot-Grail

The authors of the Lancelot-Grail Cycle used the Grail as a symbol of divine grace; the virgin Galahad, illegitimate son of Lancelot and Elaine, the world's greatest knight and the Grail Bearer at the castle of Corbenic, is destined to achieve the Grail, his spiritual purity making him a greater warrior than even his illustrious father. The Queste del Saint Graal (The Quest of The Holy Grail) tells also of the adventures of various Knights of the Round Table in their eponymous quest. Some of them, including Percival and Bors the Younger, eventually join Galahad as his companions near the successful end of the Grail Quest and are witnesses of his ascension to Heaven.

Galahad and the interpretation of the Grail involving him were picked up in the 15th century by Thomas Malory in Le Morte d'Arthur and remain popular today. While it is not explicit that the Holy Grail is never to be seen again on Earth, it is stated by Malory that there has since then been no knight capable of obtaining it.