Aubrey de Grandmesnil

Medilands firmly infers that Agnes had no children with Robert de Grantmesnil, Moreover, neither had sons named Yves or Aubrey.

On the third day of the siege of Antioch, after a terrible battle on the walls, William Grandmesnil, his brother Aubrey and Ivo of Grandmesnil, banded together with Count Stephen of Blois, father of the future king of England, and several other knights, to let themselves down from the wall on ropes under the cover of darkness. They fled on foot to the coast and the port of St. Simeon where they were transported away by ships belonging to the Knights Hospitalier. The papacy referred to this retreat as an act of cowardice, but evidence emerging from recent research on Blois and his family holdings, as well as Thebaudian revealations from the annals of Champagne, refer to the escape as a strategic move to protect certain treasures. Count Stephen, who was married to Adella, daughter of William the Conqueror, returned to Chartres with maps and strategic building plans that contributed to the formation of the Norman Gothic architectural revolution both in England (Winchester, Glastonbury, Salisbury) and in France (Amiens and Chartres.)