Baron de Longueuil (French pronunciation: [baʁɔ̃ d(ə) lɔ̃ɡœj]) is a title of French nobility that was granted originally by King Louis XIV of France to a Norman military officer, Charles le Moyne de Longueuil. Its continuing recognition since the cession of Canada by France to Britain is based on the Treaty of Paris (1763), which reserved to those of French descent all rights which they had enjoyed before the cession.[1]
The title descends to the heirs general of the first grantee, and as such survives today in the person of Michael Grant, the 12th Baron de Longueuil, a cognatic descendant of the 1st Baron.