Eufydd fab Dôn

Eufydd is presented in medieval Welsh sources as one of the Plant Dôn, the children of the mother-goddess Dôn. Genealogical tracts such as Bonedd yr Arwyr list him among Dôn's offspring, placing him within a familial pantheon that includes better-attested figures like Gwydion, Math fab Mathonwy, Gofannon, Amaethon and Arianrhod. The surviving attestations therefore frame Eufydd's origin in lineage rather than as an independent cosmogonic narrative: his identity is chiefly relational, deriving authority and role from membership in Dôn's family and the mythic epoch described as 'Gwydion's days and Amaethon's' in the Book of Taliesin.

No contemporary medieval source preserved in the provided material gives a physical description of Eufydd. He is attested only by name in poem and genealogical lists (Book of Taliesin: Prif Gyfarch Taliesin; Marwnat Aeddon; Bonedd yr Arwyr), and the textual record offers no details about stature, clothing, facial features, or other visible traits. Any reconstruction of appearance beyond the onomastic variants (Euuyd, Eueyed, Euyd, Ieunydd) would be speculative relative to the cited sources.

The extant poetic texts remember Eufydd chiefly as a practitioner of magic and a member of a cohort of skilled men. In Prif Gyfarch Taliesin he is named among 'artful men' alongside Math and Gofannon, and in Marwnat Aeddon the poem states, 'Math and Eufydd would make by magic a free man, a skillful one.' These lines portray him as engaged in magical making or transformation in the same poetic context that praises technical and magical skill. The Marwnat Aeddon passage frames that activity within a martial episode ('When this chief came from Gwydion's land... Warriors fell'), situating his named magical action in a warlike narrative setting; the sources do not provide procedural details of his magic or explicit limits, nor do they specify whether his skills are ritual, smithcraft, incantatory, or otherwise.