Lapsit Exillis
A Latin-sounding name given to the Grail in Wolfram’s Parzival.
Its meaning is uncertain, though “valueless stone” and “small stone” have been suggested. There is probably some connection with lapis exilir, the philosopher’s stone.
See also
Alchemy | Myths and Legends
Nicholas Flamel | Myths and Legends
Philosopher’s Stone | Myths and Legends
Source
Parzival | Wolfram von Eschenbach, 1200–1210