Lettre de cachet — Brill
https://referenceworks.brillonline.com/entries/encyclopedia-of-early-modern-history-online/lettre-de-cachet-SIM_023360
WebA lettre de cachet (French, “signet letter”) in French law was a special form of royal order. In contrast to public lettres de patentes , which were signed by the chancellor and confirmed with the great seal, lettres de cachet were signed by the secretary of state, and sometimes the king, and stamped with the small seal ( cachet ) of the ...
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