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Please see Peter Bartrum: https://www.geni.com/documents/view?doc_id=6000000173392989898. NOTE: the name "Llewelyn Fychan" is merely a place holder to account for a missing generation between Bartrum's Gen 8 Llewelyn and a Gen 10 Gruffudd. Bartrum does call that Gen 10 man Gruffudd ap Llewelyn in Bleddyn ap Cynfyn 32: https://www.geni.com/documents/view?doc_id=6000000173383294850 (Steven Ferry, February 13, 2021.)