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See Peter Bartrum, http://cadair.aber.ac.uk/dspace/bitstream/handle/2160/5252/bleddyn%... (February 27, 2017; Anne Brannen, curator)
Please see Peter Bartrum: Ithel Dalfrith 2; https://www.geni.com/documents/view?doc_id=6000000173392955876 & Bleddyn ap Cynfyn 17; https://www.geni.com/documents/view?doc_id=6000000173378121007 (Steven Ferry, January 2, 2024.)