Britain's Royal Families: The Complete Genealogy @ p 67
The cited information was published by rev. ed, Pimlico Random House, London 1989, 1996, held in
Not Given (See Notes)
(Ref: p 67) The author/originator was Alison Weir.
References (2)
Parent Source:
Britain's Royal Families: The Complete Genealogy
Individual:
Richard Of Cornwall KING OF ROME & ALMAINE