See Peter Bartrum, http://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5299/Bleddyn%... (May 6, 2017; Anne Brannen, curator)

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 Darrell Wolcott: The Brief Life of Gruffudd ap Maredudd; http://www.ancientwalesstudies.org/id81.html. (Steven Ferry, July 25, 2020.)

Please see Darrell Wolcott: Sandde Hardd of Mortyn; http://www.ancientwalesstudies.org/id30.html. (Steven Ferry, August 8, 2020.)

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

Please see Peter Bartrum: Morgan Hir 1; https://www.geni.com/documents/view?doc_id=6000000173392691903 & Gruffudd ap Cynan 2; https://www.geni.com/documents/view?doc_id=6000000173393090849 [Note: Bartrum conflates this man with Cadfan ap Cadwaladr] (Steven Ferry, May 25, 2024.)