Holy Grail on the Camino?

Just as the famous sword in the stone is not found in England but in Italy (since it didn’t belong to the legendary King Arthur but to Saint Galgano), the Holy Grail, despite what all the Arthurian legends woven around it claim, is in Spain. At least, that’s what Galicians and Valencians say: they both have the Grail. Or, at least, a grail.