Tangwel ap Cadfael

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

Please see Darrell Wolcott: Bartrum's "Pedigrees of the Welsh Tribal Patriarchs" #23 Marchweithian; http://www.ancientwalesstudies.org/id193.html. (Steven Ferry, September 29, 2019.)

Please see Darrell Wolcott: The Royal Family of Gwynedd - Pasgen "ap Urien Rheged", Lord of Gower; http://www.ancientwalesstudies.org/id62.html. (Steven Ferry, January 3, 2020.)

Please see Darrell Wolcott: The Men of Lleyn - How They Got There; http://www.ancientwalesstudies.org/id118.html. (Steven Ferry, August 17, 2020.)