Yspwys ap Cadrod

See Darrell Wolcott, http://www.ancientwalesstudies.org/id217.html -- footnote 2. (July 10, 2017; Anne Brannen, curator)

Please see Darrell Wolcott: The Welsh Ancestry of the Tudor Dynasty; http://www.ancientwalesstudies.org/id217.html. (Steven Ferry, April 8, 2020.)

Please see Darrell Wolcott: "Bartrum's Pedigrees of the Welsh Tribal Patriarchs" - #27 - Dafydd ap Llywarch of Eglwys Bach; http://www.ancientwalesstudies.org/id257.html. (Steven Ferry, March 16, 2021.)

Please see Darrell Wolcott: Who Was Yspwys in Welsh History?; http://www.ancientwalesstudies.org/id303.html (Steven Ferry, September 30, 2022.)