Cynfelyn ab Athrwys

See Peter Bartrum, https://www.geni.com/documents/view?doc_id=6000000173392255904 (February 5, 2023; Anne Brannen, curator)

Please see Darrell Wolcott: The Welsh Ancestry of the Tudor Dynasty; http://www.ancientwalesstudies.org/id217.html. (Steven Ferry, April 8, 2020.)

Please see Darrell Wolcott: Harleian Ms 3859; http://www.ancientwalesstudies.org/id129.html. (Steven Ferry, March 9, 2021.)

Please see Darrell Wolcott: "Bartrum's Pedigrees of the Welsh Tribal Patriarchs" - #27 - Dafydd ap Llywarch of Eglwys Bach; http://www.ancientwalesstudies.org/id257.html. (Steven Ferry, March 16, 2021.)

Please see Darrell Wolcott: Elidyr Mwynfawr Contests Rhun ap Maelgwn for Gwynedd; http://www.ancientwalesstudies.org/id231.html. (Steven Ferry, June 20, 2021.)

Please see Darrell Wolcott: Foundations of 'The Men of the North' - Part 2; http://www.ancientwalesstudies.org/id279.html. (Steven Ferry, July 9, 2021.)

Please see Dr. J White-Phillips and Darrell Wolcott: Bernicia-From Doormat to Dominant in North Britain; http://www.ancientwalesstudies.org/id280.html. (Steven Ferry, July 20, 2021.)