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The term "holy grail" is not mentioned in the Bible.
Monty Python: The Holy Grail was released in 1974.
The Production Budget for Monty Python and the Holy Grail was $400,000.
The Holy Grail is a myth. Even if there were one, it would have no relevance in Christianity.
Monty Python and the Holy Grail. Watch out for the attacking bunny.