Britain's Royal Families: The Complete Genealogy, rev. ed. @ p 71, natural dau of King John & Clementina, the wife of Henry Pinel, no date
The cited information was published by Pimlico Random House, London, England, 1989, 1996 (Ref: p 71, natural dau of King John & Clementina, the wife of Henry Pinel, no date) The author/originator was Alison Weir.