Hywel Grach ap Llewelyn

See Peter Bartrum, https://www.geni.com/documents/view?doc_id=6000000173392989914 (February 24, 2023; Anne Brannen, curator)

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5206/Bleddyn... (May 6, 2017; Anne Brannen, curator)

Please see Darrell Wolcott: The Other Gwenwynwyn; http://www.ancientwalesstudies.org/id167.html. (Steven Ferry, October 7, 2020.)

From Darrell Wolcott, Center for the Study of Ancient Wales: Marged born c. 1265, who married Hywel Grach (1265) ap Llewelyn (1230) ap Griffri (1192) ap Cadwgan (1160) . Bartrum charts this family on his "Tudor Trefor 22" but I suggest he confused 2 men called Griffri ap Cadwgan. (Steven Ferry, November 21, 2020.)