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Curt Hofemann, curt_hofemann@@yahoo.com, provided the
following on Hawise in a post-em, which casts doubt as to her identity:
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I also list her & her ancestry as you do, BUT:
This derivation (Hawise De Valois) for the wife of Roger de Mortimer is almost certainly wrong... As best I recall, she is simply Hawise, origin unknown. [Ref: Todd A. Farmerie <taf2@@po.cwru.edu> message to Gen Medieval 23 Jul 1998]
ES Volume III band 4 page 657 gives Raoul III de Valois, Count de Valois, Crepy, Vexin, etc. he married Adele de Bar-sur-Aube as his first wife. He had only children by her, not with wife 2 or 3. These children are Gautier, Simon and three daughters. The daughters come into the question, NN (Elisabeth) is married to Barthelemy de Broyes, Adele married Heribert de Vermandois, Adelaide married Thibault de Blois. Turton, in his Plantagenet Ancestry, gives an additional daughter. On page 76 he mentions Hawise de Vexin (daughter of Raoul III and Adele de Bar-sur-Aube) who married Roger de Mortimer, he died 1076. Their son, Ralph died circa 1105 and married Milicent. [Ref: Leo van de Pas <leovdpas@@iinet.net.au> message to Gen Medieval 9 Aug 1998]
The complete Peerage article on the Mortimers, ix, p. 267, identifies Roger de Mortimer's wife only as "Hawise." As you say, ES iii, 657 does not list any Hawise as daughter of Raoul III of Vexin. I assume Turton, p. 76 is in error. [Ref: Alan B. Wilson <abwilson@@uclink2.berkeley.edu > message to Gen Medieval 9 Aug 1998]