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See Peter Bartrum, https://www.geni.com/documents/view?doc_id=6000000173396507821 (February 7, 2023; Anne Brannen, curator)
Verified via correspondence with Darrell Wolcott, Center for the Study of Ancient Wales, citing ABT 1b; ByS 34; Mostyn 117,3; ByS 49 and JC 20,16. (Steven Ferry, May 26, 2020.)
Please see Darrell Wolcott: The Legendary Kingdom of Seisyllwg; http://www.ancientwalesstudies.org/id123.html. (Steven Ferry, September 11, 2020.)