1 Welsh Genealogies AD 300-1400, by Peter Clement Bartrum, 8 Vols. Cardiff, 1974, microfiche edition, 1980, Iestyn 3, p.544; Gruffudd Gethin 1, p.467.
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, Morgan Gam (d. 1241), by Professor Thomas Jones Pierce, M.A., F.S.A., Aberystwyth, citing A History of Wales: from the Earliest Times to the Edwardian Conquest; G. T. Clark , Cartae et Alia Munimenta quae ad Dominium de Glamorgan pertinent, second ed., 1910 (index); and D. Rhys Phillips, The History of the Vale of Neath, Swansea, 1925, 360-1.