NIGHTBRINGER | The Arthurian Encyclopedia

Three Unfortunate Hatchet-Blows of the Island of Britain

The Blow of Eidyn on the Head of Aneirin; the Blow on the Head of Golydan the Poet; and the Blow on the Head of Iago, son of Beli.

Red Book of Hergest | C. 1425
Text of the Mabinogion and Other Welsh Tales | John Rhys, 1887