Related Clues:

• See 22-Across
• Holy chalice of legend
• Holy ___
• Object of many knightly quests
• Quest objective
• Last Supper cup
• Last Supper item
• Galahad's goal
• Indiana Jones quest
• Kniqht's quest
• Holy __
• Goal of a certain quest
• Ultimate ideal
• 'The Da Vinci Code' subject
• Object of a knight's quest