(Research) IDENTITY: Conflict/Error> Dwnn's 'Heraldic Visitations of Wales' volume 2 page 100 calls him Rhys ap Bledri, Arglwydd of Cilysaint.
(Research) IDENTITY: Conflict/Error> Thomas' 'Golden Grove MS' book 2 page A169 combines him with his brother Ieuan "Gôch" who marriage [unknown] ferch Gruffudd. It also combines the children of both Ieuan "Gôch"s into one family.