French Olympic sailor (1859–1949)
Louis Etienne Jean Léonce Balluet d'Estournelles de Constant de Rebecque was a sailor from France, who represented his country at the 1900 Summer Olympics in Meulan, France. Jean d'Estournelles de Constant, as helmsman of the boat Pierre et Jean, took the 5th place in first race of the 0.5 to 1 ton and did not finish in the second race.
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