The story of Galahad's quest for the Holy Grail is one of the three perennial myths of Western culture. In a story that combines the gospels of Jesus, medieval romances, the Knights Templar, and myths of King Arthur, the quest for the Grail has been a 2,000-year obsession that has fascinated everybody from writers and artists to historians and poets, from J.R.R. Tolkien to Dan Brown.