Adda ap Gruffudd

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5683/Bod%20H... (November 20, 2019; Anne Brannen, curator)

See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/4798/Bod%20H... (October 30, 2019; Anne Brannen, curator)

See Darrell Wolcott, the Pedigree of Cynddelw Gam, for the untangling of these lines: http://www.ancientwalesstudies.org/id94.html (April 6, 2016; Anne Brannen, curator).

Please see Darrell Wolcott: Pedigree of Cynddelw Gam of Ystrad Alun; http://www.ancientwalesstudies.org/id94.html; [#264] (Steven Ferry, December 4, 2017.)