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See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/6516/TABLES%... (May 30, 2018; Anne Brannen, curator)
Please see Darrell Wolcott: The Consorts and Children of Gruffudd ap Llewelyn; http://www.ancientwalesstudies.org/id210.html. (Steven Ferry, July 22, 2020.)