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Immediate Family
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wife
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sister
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sister
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brother
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brother
About Hywel Grach ab Owain Cyfeiliog
See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5594/Bleddyn... (May 9, 2017; Anne Brannen, curator)
See Peter Bartrum, https://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5299/Bleddyn... (May 6, 2017; Anne Brannen, curator)
Please see Darrell Wolcott: The Royal Family of Gwynedd - Who was Maredudd ap Cynan?; http://www.ancientwalesstudies.org/id47.html. (Steven Ferry, December 17, 2019.)
Please see Darrell Wolcott: Pedigree of Madog ap Idnerth; http://www.ancientwalesstudies.org/id267.html; [#88]. (Steven Ferry, June 16, 2021.)
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