Gwyddno ap Clydno

See Peter Bartrum, https://www.geni.com/documents/view?doc_id=6000000173396072825 (February 4, 2023; Anne Brannen, curator)

Please see Darrell Wolcott: Bartrum's "Pedigrees of the Welsh Tribal Patriarchs" #1 Cynddelw ab Einion of Widigada; http://www.ancientwalesstudies.org/id169.html. Refer specifically to footnote 6. (Steven Ferry, September 11, 2019.)

Please see Darrell Wolcott: Bartrum's "Pedigrees of the Welsh Tribal Patriarchs" #8 Einudd Bach, http://www.ancientwalesstudies.org/id176.html, (Steven Ferry, September 11, 2019.)

Please see Darrell Wolcott: Bartrum's "Pedigrees of the Welsh Tribal Patriarchs" #9 Gwyddno Garanhir; http://www.ancientwalesstudies.org/id177.html. NOTE: Not to be confused with the mythical Gwyddno Garanhir. (Steven Ferry, September 10, 2019.)

Please see Darrell Wolcott: Bradwen of Llys Bradwen, in Meirionydd; http://www.ancientwalesstudies.org/id195.html. (Steven Ferry, August 31, 2020.)

Please see Darrell Wolcott; Harleian Ms 3859; http://www.ancientwalesstudies.org/id129.html. (Steven Ferry, March 10, 2021.)

http://en.wikipedia.org/wiki/Bonedd_Gw%C5%B7r_y_Gogledd

http://en.wikipedia.org/wiki/Gwyddno_Garanhir