See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5253/cydifor... (September 27, 2020; 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" #5 Rhys Chwith; http://www.ancientwalesstudies.org/id173.html. (Steven Ferry, September 10, 2019.)

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

Please see Darrell Wolcott: Llowdden Hen of Ulwch Aeron; http://www.ancientwalesstudies.org/id262.html. (Steven Ferry, March 20, 2021.)

Please see Darrell Wolcott: Sir Aaron ap Rhys, Knight of the Sepulchre; http://www.ancientwalesstudies.org/id292.html. (Steven Ferry, March 16, 2022.)

Please see Peter Bartrum: Cydifor Fawr 1; https://www.geni.com/documents/view?doc_id=6000000173378600041 & Cydifor ap Dinawal 1; https://www.geni.com/documents/view?doc_id=6000000173378013067 (Steven Ferry, March 14, 2025.)

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