Gwrtheyrn ap Rhydeyrn

See Darrell Wolcott, "Beli Mawr and Llyr Llediath in Welsh Pedigrees," http://www.ancientwalesstudies.org/id145.html -- for help in untangling these lines. (May 18, 2016, Anne Brannen, curator)

Please see Darrell Wolcott: Beli Mawr and Llyr Llediath in Welsh Pedigrees; http://www.ancientwalesstudies.org/id145.html . (Steven Ferry, Aug 25, 2019)

Please see Darrell Wolcott: Catel Durnluc aka Cadell Ddyrnllwg; http://www.ancientwalesstudies.org/id202.html. (Steven Ferry, October 7, 2019.)

Please see Darrell Wolcott: Ancient Powys; http://www.ancientwalesstudies.org/id79.html. (Steven Ferry, October 8, 2019.)

Please see Darrell Wolcott: The Royal Family of Powys - Vortigern and the Powys Dynasty; http://www.ancientwalesstudies.org/id15.html. (Steven Ferry, October 12, 2019.)

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.)