Chr'etien's story paying attention innumerable continuators, translators and interpreters in the gone 12th and olden 13th centuries, by Wolfram von Eschenbach, who makes the grail a earsplitting buttery stone that model from the sky. The Grail fairy-tale became interwoven with legends of the Sanctified Chalice.
The streak with Joseph of Arimathea and with vessels attendant with the Concluding Feast and crucifixion of Jesus, dates from Robert de Boron's Joseph d'Arimathie (following 12th century) in which Joseph receives the Grail from an hallucination of Jesus and sends it with his legion to Incalculable Britain.
Firm upon this carry some weight, gone writers recounted how Joseph recycled the Grail to place Christ's blood for example interring him and how he founded a line of guardians to maintain it unbroken in Britain. The fairy-tale may integrate Christian lore with a Celtic myth of a cauldron endowed with special powers.
Source: wicca-teachings.blogspot.com