I don’t see a lot of cups to drink from.....
The Holy Grail is considered the most sacred Christian relic, but does it actually exist?
From the knights of medieval legends to Indiana Jones, the holy grail has been the most sought-after Christian relic in popular culture for centuries. The grail is most commonly identified as the cup that Jesus drank from at the Last Supper and that Joseph of Arimathea used to collect Jesuss blood when he was crucified.
Given the importance of Jesuss crucifixion and the eucharist in Christian beliefs, the search for the grail became the holiest of quests as it signified the pursuit of union with God.
http://www.history.com/news/ask-history/what-is-the-holy-grail