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See Peter Bartrum, http://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5100/bleddyn%... (February 13, 2019; Anne Brannen, curator)
Please see Peter Bartrum: Mansel 1; https://www.geni.com/documents/view?doc_id=6000000173426885911 & Bleddyn ap Maenyrch 18; https://www.geni.com/documents/view?doc_id=6000000173377928205 (Steven Ferry, April 18, 2024.)