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Peniarth 28 is the earliest of the surviving copy of the Laws of Hywel Dda. The manuscript, which is written in Latin, dates from the second half of the thirteenth century. It is part of the Peniarth Manuscript Collection that was the foundation collection of the National Library of Wales.
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- "Peniarth 28 : a Latin text of the Laws of Hywel Dda". National Library of Wales. Retrieved 26 November 2015.