Historian David Crouch, in his ODNB biography for her husband, wrote:[1]
Keats Rohan (Domesday Descendants p.948 seems to be citing another Launceston charter (nr. 257), by her brother Robert fitz William, where he names his sister as Countess Mabilia, and Earl Reginald is first witness. As the charter is for her soul, she was perhaps dead. The charter is dated to 1155-1162, because Richard Earl of Devon (de Reviers) is second witness.
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F > FitzWilliam | D > de Dunstanville > Mabilia (FitzWilliam) de Dunstanville
Theodore W. Palmer-3058 Professor Emeritus of Mathematics University of Oregon (Proprietor of T. W. Palmer Books 259 West 23rd Avenue Eugene, OR 97405-2855 (541) 343 6536)
It seems we should consider changing both the first and second name here.
BTW here is the latest MEDLANDS text which also mentions doubts about the first name: http://fmg.ac/Projects/MedLands/ENGLISH%20NOBILITY%20MEDIEVAL1.htm#RenaudDunstanvilledied1175
Beatrice's maiden name was de Vaux or de Valle. There were children.
http://en.wikipedia.org/wiki/Reginald_de_Dunstanville,_1st_Earl_of_Cornwall