About Gwenllian verch Rhys
She inherited Rhys' lands in Dyffryn Clwyd.
See Darrell Wolcott, "The Pedigree of Cynddelw Gam," http://www.ancientwalesstudies.org/id94.html for untangling and clarification of these lines. (January 16, 2016, Anne Brannen, curator)
Please see Darrell Wolcott: Eunydd Son of Gwenllian; http://www.ancientwalesstudies.org/id51.html. (Steven Ferry, June 5, 2017.)
Please see Darrell Wolcott: Cowyrd ap Cadfan of Dyffryn Clwyd; http://www.ancientwalesstudies.org/id53.html. (Steven Ferry, June 10, 2017.)
Please see Darrell Wolcott: The Pedigree of Cynddelw Gam of Ystrad Alun; http://www.ancientwalesstudies.org/id94.html; [#7] (Steven Ferry, November 10, 2017.)