The Plantagenet Ancestry, Pages: 274 @ p 230, Bertrarde du Gommets, dau of William de Gometz
The cited information was published by Phillimore & Co., London, 1928 (repro 1993) (Ref: p 230, Bertrarde du Gommets, dau of William de Gometz) The author/originator was William Harry Turton.
Source Notes
Being Tables Showing Over 7,000 of the Ancestors of Elizabeth
(Daughter of Edward IV and Wife of Henry VII) The Heiress of
the Plantagenets, with Preface, Lists, Notes and a Complete
Index.