Seisyll ab Ithel

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/6516/TABLES%... (May 31, 2018; Anne Brannen, curator)

Please see Darrell Wolcott: The Battle of Mynydd Carn; http://www.ancientwalesstudies.org/id35.html. (Steven Ferry, May 26, 2020.)

Please see Darrell Wolcott: Trahaearn ap Caradog of Arwystli; http://www.ancientwalesstudies.org/id68.html. (Steven Ferry, July 7, 2020.)

Please see Darrell Wolcott: The "Betrayal" by Meirion Goch Revisited; http://www.ancientwalesstudies.org/id90.html. (Steven Ferry, August 15, 2020.)