Proisy was born to the family of Jeanne-Marie-Françoise de Héron and of Alphonse de Proisy.[4][5] His older brother, La Salle Proisy, also served in the Navy.[6] Proisy joined the Navy as a Garde-Marine on 26 November 1745.[6]
Proisy was promoted to Lieutenant on 17 April 1757.[6] On 23 May 1758, he married Pélagie Gouyon.[4] On 19 March 1763, he was made a Knight in the Order of Saint Louis.[4]
Goüyon, Mériadec; Boisnard, Luc (2007). Les Gouyon Matignon : huit siècles d'histoire, leurs juveigneurs, leurs alliances et leurs demeures (in French). Mayenne, France: Éditions régionales de l'Ouest. ISBN978-2-85554-128-0. OCLC799734837.
Roche, Jean-Michel (2005). Dictionnaire des bâtiments de la flotte de guerre française de Colbert à nos jours. Vol. 1. Group Retozel-Maury Millau. ISBN978-2-9525917-0-6. OCLC165892922. (1671-1870)