Cynglas Goch ab Owain, Brenin Rhos

See Peter Bartrum, https://www.geni.com/documents/view?doc_id=6000000173393240915 (February 4, 2023; Anne Brannen, curator)

Please see Darrell Wolcott: Bartrum's "Pedigrees of the Welsh Tribal Patriarchs" #12 Braint Hir; http://www.ancientwalesstudies.org/id180.html. (Steven Ferry, September 13, 2019.)

Please see Darrell Wolcott: Bartrum's "Pedigrees of the Welsh Tribal Patriarchs" #17 Caradog Freichfras; http://www.ancientwalesstudies.org/id185.html. (Steven Ferry, September 22, 2019.)

Please see Darrell Wolcott: The Royal Family of Gwynedd - Ancestry of Cynan Tyndaethwy; http://www.ancientwalesstudies.org/id16.html. (Steven Ferry, November 29, 2019.)

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

Please see Darrell Wolcott: The Interim Kings of Gwynedd's 1st Dynasty; http://www.ancientwalesstudies.org/id306.html (Steven Ferry, October 19, 2022.)

Please see Darrell Wolcott: Cynan Dindaethwy - Furter Notes; http://www.ancientwalesstudies.org/id307.html (Steven Ferry, October 21, 2022.)