See Peter Bartrum, https://www.geni.com/documents/view?doc_id=6000000173392989914 (February 24, 2023; Anne Brannen, curator)

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5596/Bleddyn... (December 30, 2016; Anne Brannen, curator)

Please see Peter Bartrum: https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/4930/Tudur%2.... (Steven Ferry, September 27, 2020.)

Please see Darrell Wolcott: The Other Gwenwynwyn; http://www.ancientwalesstudies.org/id167.html. (Steven Ferry, October 7, 2020.)

Please see Darrell Wolcott: The Unknown Cadwgan; http://www.ancientwalesstudies.org/id246.html. (Steven Ferry, November 21, 2020.)

Please see Darrell Wolcott: Gwyn ap Ednowain Bendew; http://www.ancientwalesstudies.org/id244.html. (Steven Ferry, January 2, 2021)