In Irish mythology, Ethniu ; Modern Irish: Eithne, is the daughter of the Fomorian leader Balor, and the mother of Lugh. She is also referred to as Ethliu.

In Irish mythology, Balor or Balar was a leader of the Fomorians, a group of malevolent supernatural beings, and considered the most formidable. He is often described as a giant with a large eye that