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See Peter Bartrum, http://cadair.aber.ac.uk/dspace/bitstream/handle/2160/6516/TABLES%2... (May 13 2018; Anne Brannen, curator)
The Cambro-Britain favors a source which states that St. Christialus's ancestors are Hoel ap Hoel ap Emyr Llydaw, though it acknowledges a possible but less likely ancestry in Owain ap Ynyr ap Brydain Vach. That line is not represented here.