Robert de Boron was a French poet active during the late 12th and early 13th centuries, best known for his works on the Grail legend. He is primarily credited with introducing the Christianized concept of the Holy Grail into Arthurian mythos through his Romanz de L'estoire Dou Graal, part of a trilogy which also includes Joseph d'Arimathie (Joseph of Arimathea) and Merlin. These works blended Christian theology with Arthurian legend, cementing the Grail as a symbol of divine grace and linking it to Christ's Last Supper and Joseph of Arimathea.

Robert de Boron's contributions are significant because he shaped the way the Grail story evolved in later Arthurian literature. He is one of the earliest writers to conceptualize the Grail as a sacred relic with mystical powers, transforming it into a symbol of spiritual quest and eternal life. His poetic style and imaginative narrative laid the groundwork for the extensive Grail mythology that followed.