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.
On 1 March 1821 31-year-old Prosper married 19-year-old Mary Ann Black (1801–1861) at St Philip's Church, Sydney.
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