Gwrgi ap Eliffer

See Peter Bartrum, https://www.geni.com/documents/view?doc_id=6000000173392255904 (February 5, 2023; Anne Brannen, curator)

Please see Darrell Wolcott: Harleian Ms 3859; http://www.ancientwalesstudies.org/id129.html. (Steven Ferry, March 9, 2021.)

Please see Darrell Wolcott: Foundations of 'The Men of the North' - Part 2; http://www.ancientwalesstudies.org/id279.html. (Steven Ferry, July 9, 2021.)

Please see Dr. J White-Phillips and Darrell Wolcott: Bernicia-From Doormat to Dominant in North Britain; http://www.ancientwalesstudies.org/id280.html. (Steven Ferry, July 20, 2021.)