A historical ecclesiastical officer who supervised the chamber or private quarters of a cathedral or church, responsible for vestments and valuable objects.
Compound of 'chamber' (from Latin 'camera') and 'deacon' (from Greek 'diakonos' meaning servant). Medieval church administrative terminology combining two roles.
Medieval churches had specialized officers for every tiny function—a chamberdeacon was basically the security guard for holy vestments worth small fortunes, a job that required absolute trust.
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