The Seigniory of Longueuil was first granted in 1657 to Charles le Moyne de Longueuil et de Châteauguay, Sieur de Longueuil, and was raised to the label of Barony of Longueuil in 1700 by Louis XIV in recognition of Le Moyne's services. By 1710 the Barony had expanded to include land from the St Lawrence River to the Richelieu River and south along the west bank of the river to the Seigniory of DeLéry. Charles le Moyne was killed in action near Saratoga, New York in 1729, and the barony passed to his son, also named Charles le Moyne, the third baron, who was killed during the Seven Years' War. The third baron's widow, Marie-Anne-Catherine Fleury Deschambault, married William Grant in 1770, the son of the Laird of Blairfindy, Moray, Scotland. The Barony was to be inherited by her daughter, Marie-Charles-Joseph Le Mote de Longeuil, and Grant arranged a marriage to his nephew, Captain David Alexander Grant of the British 94th Regiment. The couple were wed in 1781 and their eldest son became the fifth Baron de Longueuil in 1841. At one point the Barony included an area of about, and as the population of the area increased much of it was sold into freehold. When the seigneurial system was abolished in 1854 what had not been sold was entailed. Although dissolved, the Barony of Longueuil continued to receive seigneurial revenues until 1969. After the conquest of New France, the descendants of Charles le Moyne maintained that, since Britain had promised to respect the ancient land tenures, it was obliged to recognize Longueuil as a barony. It was not until 1880, however, that a formal request for recognition was made to Queen Victoria. The matter was submitted to the law officers of the crown, who ruled the claim to be well grounded and the rank and title of Charles Colmore Grant, seventh Baron de Longueuil, were formally recognized by royal proclamation, the royal recognition being officially announced as follows: The Queen has been graciously pleased to recognize the right of Charles Colmore Grant, Esquire, to the title of Baron de Longueuil, of Longueuil, in the province of Quebec, Canada. This title was conferred on his ancestor, Charles Le Moyne, by letters-patent of nobility signed by King Louis XIV in the year 1700. On 10 May 2004, the city of Longueuil in the province of Quebec was granted arms by the Canadian Heraldic Authority based on the arms granted by King Louis XIV in 1668 to the original Charles le Moyne, sieur de Longueuil, in the presence of the Lieutenant-Governor of Quebec and the late Raymond Grant, 11th Baron de Longueuil.
Letters patent
The original letters patent issued by Louis XIV are titled as follows: An extract, providing for the devolution of the title, reads as follows:
