The Complete Peerage vol.V.,p.153,note b states her parentage is unknown, and
refers to possible saxon ancestry for her. In The Anglo Saxon Chronicles,
1096: "William (of Eu) who was the son of his mother's sister the King
commanded..."
[S36] Brian Tompsett, Dept of Computer Science, University of Hull, England(B.C.Tompsett@dcs.hull.ac.uk), Directory of Royal Genealogical Data, (This work is Copyright b 1994-2002 Brian C Tompsett).