Rhirid ap Cadwgan

Please see Darrell Wolcott: The Royal Family of Gwynedd - The Children of Gruffudd, Nephew of Iago; http://www.ancientwalesstudies.org/id80.html. (Steven Ferry, December 13, 2019.)

Please see Peter Bartrum: Rhirid ap Rhiwallon 1; https://www.geni.com/documents/view?doc_id=6000000173392689921 (Steven Ferry, March 27, 2024.)

Please see Darrell Wolcott: Rhiryd ap Rhiwallon - Who Was He?; http://www.ancientwalesstudies.org/id323.html (Steven Ferry, March 27, 2024.)