Eri was a member of the Tuatha Dé Danann and mother of Bres.
Eri told Bres that his father was Elathan, one of the Kings of the Fomorians; that he had come to her one time over a level sea in a great vessel that seemed to be of silver; that he himself had the appearance of a young man with yellow hair, his clothes decked with gold and five rings of gold around his neck. She had refused the love of all the young men of her own people, had given him her love and cried when he had left her.
Before he left he had given her a ring from his own hand and had bade her give it only to the man whose finger it would fit. Eri brought out the ring and put it on the finger of Bres and it fitted him well. She and Bres and some of their followers then set out of the land of the Fomorians. At long last they came to that faraway land. Elathan the local King saw the ring on Bres’s hand and asked him the whole story and said that Bres was his own son. Elathan then asked Bres what it was that drove him out of his own country and his own kingship. Bres answered truthfully: “Nothing drove me out but my own injustice and my own hardness; I took away their treasurers from the people and their jewels and their food itself. And there were never taxes put on them before I was their King. And still I am come to look for fighting men that I may take Ireland by force”. Elathan listened and then bade him go to the chief King of the Fomorians, Balar of the Evil Eye