Gwrysnadd ap Dwywg

See Peter Bartrum, https://www.geni.com/documents/view?doc_id=6000000173393063941 (February 5, 2023; Anne Brannen, curator)

Please see Darrell Wolcott: The Pedigree of Cynddelw Gam of Ystrad Alun; http://www.ancientwalesstudies.org/id94.html; [#1] (Steven Ferry, November 8, 2017.)

Please see Darrell Wolcott: Pedigree of the Ancient Lords of Ial; http://www.ancientwalesstudies.org/id93.html. (Steven Ferry, April 6, 2020.)

Please see Darrell Wolcott: The Retaking of Northeast Wales in the 10th Century; http://www.ancientwalesstudies.org/id60.html. (Steven Ferry, May 25, 2020.)