Jean-Baptiste du Plessis d'Argentré (1 November 1720 – 24 February 1805) was Bishop of Séez, Normandy, from 17 Sep 1775 until his death.^[1]

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Jean-Baptiste was born in the Château de Plessis in Argentré-du-Plessis in Brittany, from where the family took their name, to Pierre, former page of Louis XIV, and Marie-Louise Hindret de Ravenne.^[2]

He was tutor to the Enfants de France, the children of the French royal family, and the King's almoner. He was also (commendatory) abbot of the abbeys of Olivet (1749), Saint-Germain d'Auxerre (1761), Silly-en-Gouffern (1776) and Saint-Aubin, Angers (1781).