notes:
"Conflict/Error> Lloyd's 'History of the Princes, the Lords Marcher and the Ancient Nobility of Powys Fadog' volume 2 page 117 and volume 3 pages 18, 20, 31, 62, 119, 124, 125, 126, 127, and 332 make him the son of Rhiwallon, but Rhiwallon is several generations removed from him."
"Conflict/Error> Griffith's 'Pedigrees of Anglesey and Carnarvonshire Families' page 238 makes him the son of Rhiwallon, but Rhiwallon is several generations removed from him."
"Conflict/Error> Lloyd's 'History of the Princes, the Lords Marcher and the Ancient Nobility of Powys Fadog' volume 2 pages 118 and 149 state he was slain in battle by Gruffudd ap Cynan in Lleyn in 1074, thus confusing him with Cynwrig ap Rhiwallon, the actual son of Rhiwallon, whereas this Cynwrig is several generations removed from Rhiwallon."