Background
He was born Roch-Louis de Saint-Ours in the town of Quebec in 1753.
He was born Roch-Louis de Saint-Ours in the town of Quebec in 1753.
He became a major in the militia in 1774 and took part in the defence of Fort Street John's (later Saint-Jean-sur-Richelieu) against the Americans. He was taken prisoner, returned to Quebec in 1777 and became a lieutenant in the Canadian volunteers. He was named aide-de-camp to Governor Sir Guy Carleton and also served as aide-de-camp for Prince William Henry, who later became William IV, during his visit to the province in 1787.
In 1792, he inherited parts of the seigneuries of Saint-Ours, L’Assomption, and Deschaillons.
He eventually acquired all of the seigneury of Saint-Ours. He became a captain in the regular army in 1795, later retiring on half pay.
Saint-Ours was named to the Legislative Council of Lower Canada in 1808 and remained a member until his death. He served as colonel in the militia during the War of 1812.
He died at Saint-Ours in 1834.