Deicws Ddu ap Madog

See Peter Bartrum, https://www.geni.com/documents/view?doc_id=6000000173427285962 (July 23, 2023; Anne Brannen, curator)

See Peter Bartrum, https://www.geni.com/documents/view?doc_id=6000000173392791976 (July 20, 2023; Anne Brannen, curator)

Please see Darrell Wolcott: Pedigree of Cynddelw Gam of Ystrad Alun; http://www.ancientwalesstudies.org/id94.html; [#275] (Steven Ferry, December 6, 2017.)

Please see Darrell Wolcott: Marchweithian of Is Aled - Further Notes; http://www.ancientwalesstudies.org/id318.html. (Steven Ferry, September 9, 2023.)

Please see Peter Bartrum: Maelog Crwm 1; https://www.geni.com/documents/view?doc_id=6000000173392732874 & Trahaearn Goch of Llyn 2; https://www.geni.com/documents/view?doc_id=6000000173392791976 (Steven Ferry, April 1, 2024.)