John Charles Moore de Bienville Grant, 9th Baron de Longueuil was born in 1861 at Bath, Somerset. He was the son of Charles James Irwin Grant and Anne Marie Catherine Trapman. He succeeded to the title of Baron de Longueuil on 3 August 1931. He died on 17 October 1935 at Pau, France.
recognized by the Crown in right of Canada