Scholars have long known that the Grail is essentially legendary, a mystic symbol forever sought by those seeking Enlightenment, a quest in which the search is as important as the result. Time and again it has been said that the Grail is a construct of mystical Christian ideas and motifs from the ancient oral tradition of the Celtic-speaking peoples of Britain. There is much to commend this view, but now, drawing on decades of research in his native Scotland, in a major new contribution to the Grail legend, the field historian and folklorist Stuart McHardy traces the origin of the idea of fertility and regeneration back beyond the time of the Celtic warrior tribes of Britain to a truly ancient, physical source. This is a physical source as dynamic and awesome today as it was in prehistory when humans first encountered it and began to weave the myths that grew into the Legend of the Holy Grail.