Pierre de Mauvoisin de Rosny

Pierre de Mauvoisin, called de Rosny, was a cleric from the Rosny line of the Mauvoisin family of the Île-de-France. He became archdeacon of Brie in the church of Paris in 1343 and, from 1346, a canon of Notre-Dame; he also served as a master of requests in the royal Hôtel.

With his brother Amaury, likewise a Paris canon, he donated family lands to their niece Yde de Beausart and her husband Jean de Saquainville. Pierre died in 1397.