A digital edition of the work of Dafydd ap Gwilym (a Welsh poet of the 14th century). The work consists of 170 poems, almost all of which survive in manuscripts between 100 and 200 years later than their original composition, and bear signs of textual corruption deriving from oral transmission. The project aims to restore the original texts as far as possible (bearing in mind that the poet's compositions may not have had an entirely fixed form). The methodology of textual reconstruction will be explicit, in contrast to the somewhat arbitrary and subjective quality of the texts in Thomas Parry's Gwaith Dafydd ap Gwilym (1952). Critical texts will be accompanied by transcriptions and digital images of the earliest manuscripts, paraphrase in modern Welsh and English translation, textual and explanatory notes, and recordings of performances of the poems. At least 19 of the poems are of uncertain authorship, and the arguments for and against their authenticity will be set out, including a full account of the large body of apocrypha attributed to Dafydd ap Gwilym.