Joseph Coëtnempren de Kersaint was born to the family of Guy François Coëtnempren de Kersaint, a French Navy officer.
[1] He served on Heure du Berger from November 1767 to January 1769.
[1] Kersaint married at Isle de France on 3 April 1780.
[1] In June 1782, Kersaint, by then retired from the Navy,[2] departed Brest, captaining the corvette Duc de Chartes.
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