​IEUAN Ddu ab Dafydd ab Owain (fl. 1440–1480), Welsh poet, also known as Ieuan Dafydd Ddu and Ieuan Dafydd ab Owain, resided at or near Aberdare in Glamorganshire, and, being a gentleman of large estate, was a generous patron of the bards (Owen, Cambrian Biography, s.v.) The first lines of some of his poems are given in Moses Williams's 'Repertorium Poeticum,' London, 1726, 8vo. Three of his pieces are preserved in the British Museum, Add. MS. 14984, and a fourth in Add. MS. 14998.

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