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See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/6516/TABLES%... (May 5, 2018; Anne Brannen, curator)
Please see Darrell Wolcott: The Royal Family of Gwynedd - Maelgwn Gwynedd, The Dragon of Anglesey; http://www.ancientwalesstudies.org/id166.html. (Steven Ferry, November 28, 2019.)