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The development of the Grail legend has been traced in detail by cultural historians: It is a gothic legend, which first came together in the form of written romances, deriving perhaps from some pre-Christian folklore hints, in the later 12th and early 13th centuries.
The legend of the Holy Grail is the basis of the use of the term holy grail in modern-day culture.
For the authors of Holy Blood, Holy Grail, who assert that their research ultimately reveals that Jesus may not have died on the cross, but lived to marry Mary Magdalene and father children whose Merovingian bloodline continues today, the Grail is a mere sideshow.
Grail (Graal) - Magic vessel with miraculous healing powers protected by an otherworldly keeper or "king." Pagan fertility myths and their related talismans along with the concept of a symbiotic union between the king and the land were all precursors to what was to eventually become the object of Arthur and his knights' Quest.
The christianization of the Grail in plain terms begins with Robert de Boron and is adapted by his successors into a larger myth.
The quest itself is sometimes intimated to be one of the causes for the dissolution of the Round Table, drawing away it's best and bravest knights and inadvertently initiating a moral decline that culminates in the triumph of Mordred's plots in destroying the order.