A person who works in or tends to a chamber, often a servant or attendant in a royal or noble household.
From 'chamber' (from Old French 'chambre', from Latin 'camera' meaning vaulted room) plus the agent suffix '-er'. The word emerged in medieval English to describe household servants assigned to private rooms.
In medieval times, a chamberer's job was incredibly important—they controlled access to the king's private chambers and were trusted with intimate knowledge of court secrets, making them some of the most influential servants despite their low social rank.
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