Gods and Fighting Men: The Story of the Tuatha De Danaan and the Fianna of Ireland

Now it chanced at that time there were three brothers of the Tuatha de Danaan living together in a place that was called Druim na Teine, the Ridge of the Fire, Goibniu and Samthainn and Cian. Cian was a lord of land, and Goibniu was the smith that had such a great name. Now Clan had a wonderful cow, the Glas Gaibhnenn, and her milk never failed. And every one that heard of her coveted her.