Source data: Brown, A. E. (1972). "The Castle, Borough and Park of Cefnllys". The Radnorshire Society Transactions. 42: p. 17. Browne, David M.; Pearson, Alastair (2006). Cefnllys Castle (Report). Royal Commission on the Ancient and Historical Monuments of Wales. pp. 3, 8–16. Remfry, Paul Martin (2008). Three Thirteenth Century Castles in Maelienydd (Paper). Academia.edu. p. 14
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