. . . It is argued that Saint-Louis-de-France (1214-1270) being the first holder of the former mission of the Vieilles-Forges (1740), to which Saint-Louis-de-France once belonged, renamed in 1921 Saint-Michel-Archange-des-Forges, sometimes Saint-Michel-Archange-des-Vieilles-Forges, it is for this reason that his name was transplanted to the parish on whose territory the Forges du Saint-Maurice began their activities in 1738. Canonized in 1297, Louis IX demonstrated a great spirit of peace and piety.
. . . However, account may also have been taken of the fact that the bishop of Trois-Rivières, Monseigneur Laflèche (1818-1898), to whom petitions were submitted to open a new parish, was Louis-François. According to another explanation, Saint-Louis-de-France would constitute a calque of Saint-Louis-des-Français, name of the French national church of Rome.
— Source: Trois-Rivières, origine et signification,[1]