Holy Grail

The Holy Grail is the most famous sacred object that may never have existed as a thing at all. In the Arthurian tradition it is the vessel of the Last Supper, sometimes said also to have caught the blood of Christ at the cross, hidden away and sought by the knights of the Round Table in a quest that tests their purity. It differs from the relics of Turin, Oviedo or Valencia in kind: it is a creation of medieval romance that took on the aura of a relic, rather than a physical object with a custodial history. Precisely because the legend is so powerful, real cups have repeatedly been put forward as the genuine Grail, from the agate chalice of Valencia to the green dish of Genoa and a wooden bowl in Wales, but none has any authenticated claim. The Grail is therefore best treated as a legendary object whose importance is literary and spiritual.

Chretien de Troyes left Perceval unfinished at his death around 1190, breaking off without ever explaining what the graal actually was, part of why the object proved so adaptable to reinterpretation: Robert de Boron's Joseph d'Arimathie, written within a decade or two of Chretien's poem, supplied the Christian backstory that fixed the Grail as the vessel of the Last Supper and tied it to Joseph of Arimathea's journey to Britain, a connection with no basis in the canonical Gospels. The thirteenth-century Vulgate and Post-Vulgate prose cycles wove the Grail quest into the larger Arthurian corpus, elevating the previously minor knight Galahad into the only knight pure enough to achieve the vision. Wolfram von Eschenbach's German Parzival, composed independently, describes the Grail not as a cup but as a stone, evidence the object's physical form was never fixed within the medieval tradition itself.

The Grail enters written literature in the romance Perceval, or the Story of the Grail, composed by the French poet Chretien de Troyes around 1190 and left unfinished at his death. There the graal is simply a resplendent serving dish carried in a strange procession, its full significance withheld. The decisive transformation came shortly after with Robert de Boron, whose Joseph d'Arimathie recast the object as the cup of the Last Supper, entrusted to Joseph of Arimathea, used to gather Christ's blood, and brought westward to Britain, founding a lineage of Grail keepers.

The thirteenth-century prose cycles, especially the Lancelot-Grail, made the quest a Christian allegory culminating in the pure knight Galahad. Later centuries attached the name to particular vessels, and modern popular culture, from Wagner to films, has kept the legend vividly alive while adding no historical substance to it.

There is no tradition of a single, continuously venerated Grail object to authenticate, and scholarship treats the Grail first of all as a literary phenomenon. Studies such as Roger Sherman Loomis's trace its development out of Celtic myths of magical vessels and cauldrons of plenty, Christianized by Robert de Boron into the cup of the Last Supper; the debate among specialists is over these literary and mythological roots, not over a physical relic.

The several cups later claimed as the Grail, the Santo Caliz of Valencia, the Sacro Catino of Genoa, the Nanteos Cup of Wales and others, are real objects with their own histories, but none is documented back to the first century or evidentially connected to Jesus, and they cannot all be the Grail in any case. Because no physical object is established and the Grail's existence as a relic is unproven, it is classed as legendary in existence and debated in authenticity.