Oman notes:
KINSHIP: Conflict/Error> Dwnn's 'Heraldic Visitations of Wales' volume 1 page 77 and volume 2 pages 178, 213, 282 and 302 give his father as Llywarch "Holbwrch".
KINSHIP: Conflict/Error> Dwnn's 'Heraldic Visitations of Wales' volume 2 page 69 calls him Llywarch "Holbwrch".
KINSHIP: Conflict/Error> Griffith's 'Pedigrees of Anglesey and Carnarvonshire Families' pages 32, 88, 90, 91, 132, 147, 224, 234, 241, 276, 317, 356, and 392 make him the son of his great grandfather Llywarch "Hwlbwrch".
KINSHIP: Conflict/Error> Lloyd's 'History of the Princes, the Lords Marcher and the Ancient Nobility of Powys Fadog' volume 2 page 129, volume 4 pages 267 and 323, and volume 6 page 224 give his father as Llywarch "Hwlbwrch", thus omitting several generations.