Cauldron of Annwn

Cauldron of Annwn had a potion brewed in it which could bestow all knowledge. A youth, Gwion, was set to stir this by the goddess Ceridwen. He spilled three drops onto his fingers and put them into his mouth. He gained all knowledge. Note too that the Grail in Arthurian legend could bestow knowledge. Many authors have thus tried to show that the celtic cauldrons are in some sense a forerunner to the modern Grail image. Cited from the Theories of SanGraal