Walter is mentioned as the son of Robert and Herlave in: Massan de St. Amand, A....

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Walter is mentioned as the son of Robert and Herlave in: Massan de St. Amand, A. (1813). Essais historiques et anecdotiques sur l'ancien comté, les comtes et la ville d'Evreux. Google Books.[1] He isnot named as a son by Wikipedia, Baldwin (n.d.) or Cawley (2006).

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