Roger de Mortimer 
Roger's father was Hugh Bishop of Coustances and his mother was Gundrada de Crêpon. His maternal grandfather was Herbastus de Crêpon. He had a brother named Rudolph. He died before 1090.1 
Details of Roger's family with Hawise (de Mortimer)
1 SUSANNA KEENE.FTW
Further sources/citations:
usenet newsgroup soc.genealogy.medieval, Listserve: usenet @ Alan B. Wilson has him s. of Beatrix de Vascoeuil & Rudolph de
Warenne, Elmore, Lorraine Ann "Lori" (Garner), Recipient: J.H. Garner, @ s of Hugh Bishop of Coustances & Gundrada de Crepon
Further sources/citations:
usenet newsgroup soc.genealogy.medieval, Listserve: usenet @ Alan B. Wilson has him s. of Beatrix de Vascoeuil & Rudolph de
Warenne, Elmore, Lorraine Ann "Lori" (Garner), Recipient: J.H. Garner, @ s of Hugh Bishop of Coustances & Gundrada de Crepon
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