About 1080 Gilbert de Corbeil, grandson of Werlac, married Isabella Lupus, daughter of Richard de Avranches, a descendent of Hrollarf, son of Rognvald and brother of Rollo. Hrollarf and his descendents held to the old insignia of the wolf head, hence the wolf head was the arms of her family.As a consequence any member of the family who descended from this marriage had the right to impale the family arms with the wolf head erased of the field, which was the arms of the Lupus or Avranches family.
See figure No. 6 below:
