Robert de Boron
Robert de Boron (also spelled in the manuscripts "Bouron", "Beron") was a French poet of the late 12th and early 13th centuries who is most notable as the author of the poems Joseph d'Arimathe and Merlin. Though little is known about him outside of the poems he allegedly wrote, his works and their subsequent prose redactions impacted later incarnations of the Arthurian legend and its prose cycles, particularly due to his Christian backstory for the Holy Grail, originally an element of Chretien de Troyes's famously-unfinished Perceval.
“I believe, whoever sees the Grail will find it agreeable. It charms all those of this land, they find it pleasant and agreeable; those who are able to remain with it and can bear its presence, when they see it they feel delight, they are as happy as a fish when a man holds it in his hand, and it can escape from his hand and return to swimming unconfined in the water.”
Robert de Boron