A medieval treasury or office for safekeeping important documents and valuables in a royal or noble household.
From Old French hanap (goblet, cup) combined with -er, originally referring to a cup-shaped wicker container, later used metaphorically for any storage container for important items.
The hanaper in medieval England actually became an office title—the 'keeper of the hanaper' was a powerful position controlling royal seals and documents, showing how a simple storage basket became a symbol of bureaucratic authority.
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