Gwrgant Barbtruch ap Cadwaladr

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

See Darrell Wolcott -- http://www.ancientwalesstudies.org/id195.html "Bradwen of Llys Bradwen" for the untangling of these lines. (April 25, 2016; 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 : The Royal Family of Gwynedd - Meirion Meirionydd, "Grandson" of Cunedda; http://www.ancientwalesstudies.org/id3.html. (Steven Ferry, November 22, 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.)