One of the mysteries of the English language finally explained.
In England: (the title of) an officer in the Courts of Common Pleas and King's (or Queen's) Bench, having custody of writs and warrants; = "Keeper of the Writs".
Late 16th century. From post-classical Latin custos brevium from classical Latin custōs + brevium, genitive plural of breve.
custos brevium/ˌkʌstɒs ˈbrɛvɪəm/
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