Madoc ap Hywel Felyn

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/4968/bleddyn... (October 15, 2019; Anne Brannen, curator)

Please see Peter Bartrum: Cydrych 3; https://www.geni.com/documents/view?doc_id=6000000173384084847 & Cydrich 2; https://www.geni.com/documents/view?doc_id=6000000173384084845 .(Steven Ferry, November 2, 2020.)

Please see Darrell Wolcott: Bleddyn ap Maenyrch, King of Brycheiniog; http://www.ancientwalesstudies.org/id313.html (Steven Ferry, March 2, 2023.)

Please see Darrell Wolcott: Gwgan ap Llewelyn ap Moriddig of Brycheiniog; http://www.ancientwalesstudies.org/id315.html (Steven Ferry, June 26, 2023.)

Please see Darrell Wolcott: Ifor Bach, Lord of Senghenydd; http://www.ancientwalesstudies.org/id316.html (Steven Ferry, August 4, 2023.)

Please see Darrell Wolcott: How Bartrum 'Lost' Hywel ap Gruffudd ap Ifor Bach; http://www.ancientwalesstudies.org/id317.html (Steven Ferry, August 9, 2023.)