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See Darrell Wolcott, the Pedigree of Cynddelw Gam, for the untangling of these lines: http://www.ancientwalesstudies.org/id94.html (March 31, 2016; Anne Brannen, curator).
Please see Darrell Wolcott: Pedigree of Cynddelw Gam of Ystrad Alun; http://www.ancientwalesstudies.org/id94.html; [#255] (Steven Ferry, December 3, 2017.)
Please see Peter Bartrum: Rhirid ap Rhiwallon 2; https://www.geni.com/documents/view?doc_id=6000000173393115902 (Steven Ferry, March 28, 2024.)
Please see Darrell Wolcott: Rhiryd ap Rhiwallon - Who Was He?; http://www.ancientwalesstudies.org/id323.html (Steven Ferry, March 28, 2024.)
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