Dafydd ab Einion

Please see Darrell Wolcott: Bartrum's "Pedigrees of the Welsh Tribal Patriarchs"' # 4 Cadwgan Fantach; http://www.ancientwalesstudies.org/id172.html. (Steven Ferry, September 7, 2019.)

Please see Darrell Wolcott: The Royal Family of Gwynedd: Einion ap Llywarch of Carmanthenshire; http://www.ancientwalesstudies.org/id163.html. (Steven Ferry, April 8, 2017.)

Please see Peter Bartrum: Rhydderch ap Tewdwr 1; https://www.geni.com/documents/view?doc_id=6000000173392689930 & Marchudd 14; https://www.geni.com/documents/view?doc_id=6000000173393063899 (Steven Ferry, November 29, 2024.)