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See Peter Bartrum, https://www.geni.com/documents/view?doc_id=6000000173395725860 (Februar7 8. 2023; Anne Brannen, curator)
Please see Darrell Wolcott: Who Was Yspwys in Welsh History?; http://www.ancientwalesstudies.org/id303.html (Steven Ferry, May 2, 2023.)