Elestron is a lesser known child of Dôn, and presumably her consort Beli Mawr.
Elestron He is mentioned in the genealogical tract “Bonedd yr Arwyr”.
25. Plant Don o Arvon
Bonedd yr Arwyr
Gwydion, Govannon, Amaethon, Hunawg, Idawl, Ienuydd, Elestron, Digant, Gyluaethwy, Kynnan, Hedd, Addien, Elawg, Arianrhod
He is also mentioned in Llyfr Taliesin, the Book of Taliesin with his brothers.
I have been with skilful men,
The First Address of Taliesin
With Matheu and Govannon,
With Eunydd and Elestron,
In company with Achwyson,
Elestron: his name means “lily”