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He forfeited his estates (the manor of Llechycastell and the de la Bere lands in Gwyr) after he killed his cousin Thomas Ddu ap Gronwy.
See Peter Bartrum, http://cadair.aber.ac.uk/dspace/bitstream/handle/2160/4944/bleddyn%... (July 23, 2017; Anne Brannen, curator)
See Peter Bartrum, http://cadair.aber.ac.uk/dspace/bitstream/handle/2160/6172/BASSET%2... (December 21, 2016; Anne Brannen, curator)