After his studies he went to Quebec, where he worked as an editor of the newspaper Le Canadien from November 1808 to May 1809. Viger served as captain in the Canadian Voltigeurs unit under Charles de Salaberry during the War of 1812. He was elected the first mayor of Montreal in 1833 and worked to improve its sanitary conditions. Although he wrote little, his reputation as an archaeologist was universal, and the greatest contemporary historians of France and the United States have drawn from his collection of manuscripts, based on forty years of research. He compiled a chronicle under the title of "Sabretache" (28 vols.), wherein he gathered plans, maps, portraits, and valuable notes illustrating many contested historical points. He was the founder of the Historical Society of Montreal in 1857, one year before his death. Pope Pius IX honoured him with the knighthood of the Order of St. Gregory the Great.
He died December 12, 1858, at age 71, and was buried in the crypt of the Notre-Dame-de-Grâce Church on December 15.
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