He represented Richelieu in the Legislative Assembly of Lower Canada from 1824 to 1832.
Saint-Ours was lieutenant and then colonel in the local militia.
In 1830, he was named commissioner for improving navigation on the Richelieu River.
He married Catherine-Hermine Juchereau Duchesnay, the granddaughter of Antoine Juchereau Duchesnay and Ignace-Michel-Louis-Antoine d'Irumberry de Salaberry, in 1833.
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