The next record of Prosper de Mestre is not in Martinique, but in Philadelphia, Pennsylvania, as his parents had moved; this is where he received his schooling.
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On 1 March 1821 31-year-old Prosper married 19-year-old Mary Ann Black (1801–1861) at St Philip's Church, Sydney.
Prosper Mérimée | Prosper of Aquitaine | Prosper | Prosper, Texas | Prosper High School | Thomas Prosper Jullien | Saint Prosper | Prosper Weil | Prosper Louis, 7th Duke of Arenberg | Prosper Dérivis | Prosper d'Épinay | Prosper de Mestre | Prosper Anton Josef von Sinzendorf | Louis Prosper Gachard | Etienne L. de Mestre | Claude Prosper Jolyot de Crébillon |
Mary Ann de Mestre née Black (1801–1861) was the wife of Prosper de Mestre (1789–1844) a prominent Sydney businessman in the early 19th century; and the mother of Etienne Livingstone de Mestre (1832–1916) the trainer of the racehorse Archer who won the first and second Melbourne Cups in 1861 and 1862, and the foremost Australian horse trainer of his era.