Manuscript known best as the Book of Aneirin (Llyfr Aneirin), containing the heroic poem Y Gododdin and a number of gorchanau.
- s. xiii2
- c. 1564/1565
- 1604-1610
- John Jones [of Gellilyfdy]
- s. xivex–xvin
Latin text of Welsh law, which was known to lawyers active in Gwynedd during the 13th century. This text or a related one may have provided the basis for the Latin text in London, British Library, MS Cotton Vespasian E xi, which refers to matters relating to both Gwynedd and south-west Wales. It has been suggested that the Llyfr y Tŷ Gwyn text became known in Gwynedd through the agency of Cadwgan, bishop of Bangor (1215-1236) and abbot of Whitland before that.
- s. xiv-xv
- Anonymous [scribe I of Llyfr Coch Hergest], Hywel Fychan ap Hywel Goch, Anonymous [scribe of Llyfr Teg]
- 1346
- Anchorite of Llandewi Brefi