P.M. Matarasso, translator of THE QUEST OF THE HOLY GRAIL, Penguin, 2005, writes this about Richard Barber's incredibly erudite romp through Grail history:
"The book which serves as the best introduction and most reliable guide to the Grail myth in literature and literary consciousness from the twelfth century to the present day is Richard Barber's THE HOLY GRAIL: IMAGINATION AND BELIEF, Penguin, London, 2004. After giving full weight to the spectrum of medieval texts, it follows the Grail as symbol through to the wilder shores of New Age fantasy, covering a vast terrain with authority and grace. The thirty-page bibliography is up to date and comprehensive." (30)

From Barber's Introduction:
"The Grail is a mysterious and haunting image, which crosses the borders of fiction and spirituality, and which, for eight centuries, has been a recurrent ideal in
Western literature. What follows is an attempt to trace what we know about the Grail: it is, in all its forms, a construct of the creative imagination, but one which lays claim to the highest of religious ideals and experience. Even when it has been neglected for centuries, it has reappeared to appeal with renewed vigour to artists and writers; and from its first shape as a Christian symbol it has been recreated in a multitude of different forms.
"Such a topic exerts an extraordinary attraction for lovers of historical conundrums and enthusiasts for the esoteric and mysterious, particularly because we cannot give an answer to the question 'What is the Holy Grail?' The very first writer to mention it, who probably invented the idea, makes his story hinge on a similar question - 'What is the Grail for?' - and because he never provided the answer for his own riddle, the question continues to be asked. The initially mysterious and undefined 'Grail' had extraordinary repercussions: in a brief time span half a dozen major writers tried their hands at either completing the original stories or creating new ones, and in the process virtually invented a new art form, the prose romance, which many centuries later became the modern novel." (pg 1)