Ceredig ap Gwylog Marchog Trin, of Elfed

See Peter Bartrum, http://cadair.aber.ac.uk/dspace/bitstream/handle/2160/6516/TABLES%2... (May 5, 2018; Anne Brannen, curator)

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.)