The title Baron de Longueuil was granted to Charles Le Moyne in 1657, and when he died in Montreal in 1729, the barony was passed to his son.
Charles (II) le Moyne de Longueuil, Baron de Longueuil (December 10, 1656  June 7, 1729) was the first native-born Canadian to be made Baron in New France. 
