1 Welsh Genealogies AD 300-1400, by Peter Clement Bartrum, 8 Vols. Cardiff, 1974, microfiche edition, 1980, Iestyn 2, p.543, Iestyn 9, p. 550.
2 Annals and Antiquities of the Counties and County Families of Wales, by Thomas Nicholas, London: Longmans, Green, Reeder, 1875, II, 621.
3 A Genealogical and Heraldic History of the Commoners of Great Britain and Ireland, John Burke, London: Published for Henry Colburn, by R. Bentley, 1834-1838, IV:653.
4 Dictionary of Welsh Biography, Caradog ap Iestyn (fl. 1130), by Sir John Edward Lloyd, D.Litt., F.B.A., F.S.A. (1861-1947), Bangor, citing J. E. Lloyd, A History of Wales: from the Earliest Times to the Edwardian Conquest, 402, 440, 504, 572.