The Book of Cynog (; ; ) was a text of medieval Welsh law.Wade-Evans, Arthur. Welsh Medieval Law, p. 343. It is quoted extensively by surviving sources but does not appear to have survived intact. However, the first 75 folios of Peniarth MS. 35 seem to be a medieval attempt to reconstruct the earlier book.Wiliam, Aled Rhys. "Restoration of the Book of Cynog". National Library of Wales Journal, Vol. 25, No. 3 (1988), p. 245256. Accessed 27 Feb 2013.
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