In Irish mythology, Elatha or Elathan (modern spelling: Ealadha) was a prince of the Fomorians and the father of Bres by Eri of the Tuatha Dé Danann. The imagery surrounding him (he visits Ériu at night by sea on a silver boat) suggests he may once have been a moon god.
Elathan is quoted as being the "The beautiful Miltonic prince of darkness with golden hair". He was the son of Dalbaech and a king of the Fomor, he was father of Bres by Eri, a woman of the Tuatha de Danann. He came to her over the sea in a vessel of silver, himself having the appearance of a young man with yellow hair, wearing clothes of gold and five gold torcs. He was one of the Fomor who took part in the Second Battle of Magh Tuireadh.
During the Second Battle of Magh Tuireadh, Elathan, son of Dalbaech, watched over Dagda's magic harp, Uaithne, sometimes called Dur-da-Bla, the Oak of Two Blossoms, and sometimes Coir-cethar-chuin, the Four-Angled Music. He is said to have a sense of humor and a sense of nobility.
Though considered to be the Fomorian father of Eochu Bres, Elatha (Elada) was also the father of the Dagda, Ogma, a son named Delbaeth, and Elloth (the father of Manannan mac Lir) according to the Lebor Gabala Erinn. The mother of these "Tuatha De Danann" chiefs may have been Ethne, the mother of Lug, based on Ogma's often cited matronymic "mac Ethliu." Since Ethne was Fomorian, this means they are all Fomorians. This is rather confusing, but may betray the battle between the two groups as actually being about the new generation of gods displacing the older generation.