A collection or written record of customary law and local legal traditions; a medieval legal code documenting established customs and precedents of a region.
From Old French 'coustumier' (customary), derived from 'costume' (custom), referring to written compilations of the unwritten laws and traditions of a particular territory or community.
Before modern law codes existed, societies compiled 'coustumiers'—written records of 'how things have always been done'—literally trying to freeze tradition on parchment before memories faded.
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