Oratory of Saint Philip Neri
Duperré was born in La Rochelle to Jean Augustin Duperré, counselor of the king and financer for war, and Marie-Gabrielle Prat-Desprez. He spent a few years with the Oratory of Saint Philip Neri at the Collège de Juilly, before enlisting at 16 on the "Henri IV", a French East Indiaman.