Seisyll ab Eiddon Ddu

See Peter Bartrum, https://www.geni.com/documents/view?doc_id=6000000173395725864 (February 5, 2023; Anne Brannen, curator)

See Darrell Wolcott, "Llewelyn ap Hoedliw" -- http://www.ancientwalesstudies.org/id154.html -- for the untangling of these lines. (April 25, 2016; Anne Brannen, curator)

Please see Darrell Wolcott: Bartrum's "Pedigrees of the Welsh Tribal Patriarchs" - #1 Cynddelw ab Einion of Widigada; http://www.ancientwalesstudies.org/id169.html. (Steven Ferry, September 4, 2019.)

Please see Darrell Wolcott: The Legendary Kingdom of Seisyllwg; http://www.ancientwalesstudies.org/id123.html. (Steven Ferry, September 11, 2020.)

Please see Darrell Wolcott: Early Ceredigion and its Rulers; http://www.ancientwalesstudies.org/id158.html. (Steven Ferry, September 11, 2020.)

Please see Darrell Wolcott: Llewelyn ap Hoedliw, Lord of Is Cerdin; http://www.ancientwalesstudies.org/id154.html. (Steven Ferry, September 11, 2020.)