He was born in Beaumont, the son of seigneur Joseph Roy and Gabrielle Sarault. He inherited the seigneury of Varennes from his father in 1791; Roy sold the seigneury in 1847. In 1792, he married Marie-Charlotte Talbot dit Gervais. He was a major in the militia, reaching the rank of lieutenant-colonel in 1815. Roy did not run for reelection in 1820. He died in Beaumont.
His sister Marie-Gabriel married Louis Blais.
- "Biography". Dictionnaire des parlementaires du Québec de 1792 à nos jours (in French). National Assembly of Quebec.