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See Peter Bartrum, http://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5569/Bleddyn%... (January 9, 2017; Anne Brannen, curator)
See Darrell Wolcott, the Pedigree of Cynddelw Gam, for the untangling of these lines: http://www.ancientwalesstudies.org/id94.html (March 24, 2016; Anne Brannen, curator).
Please see Darrell Wolcott: The Pedigree of Cynddelw Gam of Ystrad Alun; http://www.ancientwalesstudies.org/id94.html; [#253] (Steven Ferry, December 2, 2017.)