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They were first cousins. The following sources: (1) J E Lloyd *A History of Wales from the Earliest Times to the Edwardian Conquest* 2 vols, 3rd ed. (London, 1939), (2) *The Dictionary of Welsh Biography down to 1940* (Oxford, 1959) eds. J E Lloyd & R T Jenkins, (3) *The Kings and Queens of Great Britain: a genealogical chart showing their descent and relationships* [New revised edition] compiled by Anne Taute, edited by J Brooke-Little (Richmond Herald) & drawn by D Pottinger (Unicorn Pursuivant), (4) *The Dictionary of National Biography*. Cousin marriages were not uncommon amongst the Welsh dynasties. The ecclesiastical prohibition of first cousin marriages was frequently ignored in Wales (and elsewhere) during this period.