See also Darrell Wolcott's article, "Was Iestyn ap Gwrgan the Founder of One of ...

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See also Darrell Wolcott's article, "Was Iestyn ap Gwrgan the Founder of One of the 5 Royal Tribes", which starts with a discussion Philip Yorke's book The Royal Tribes of Wales immortalised five ruling dynasties and their kingdoms. Yorke's book is cited for the FamilySearch entry at this link for Iestyn ap Gwrgan (975-1093), "King of Glamorgan", son of Gwrgan ap Itel (0953-1030), both links apparently part of a pedigree file (links accessed 23 March 2020).

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