Cadwgan ap Rhirid

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5092/bleddyn... (December 24, 2016; Anne Brannen, curator)

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 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.)