Dosparth Edeyrn Davod Aur; Or, the Ancient Welsh Grammar, Which Was Compiled by Royal Command in the Thirteenth Century by Edeyrn the Golden Tongued, to Which Is Added Y Pum Llyfr Kerddwriaeth, or the Rules of Welsh Poetry, Originally Compiled by Davydd Ddu Athraw, in the Fourteenth, and Subsequently Enlarged by Simwnt Vychan, in the Sixteenth Centry: With English Translations and Notes

Edeyrn, Davod Aur, fl 1270.