Lugh was the son of the beautiful Eithne who was the daughter of Balor of the Evil Eye. Balor imprisoned Eithne in a high tower so that she would never have a son, as it had been prophesised that he would be slain by his own grandson. But, in stealing the great cow called Glas Ghoibhneann from Cian, Balor drew him to his island in search of his property. It was then that Eithne first saw Cian, who she recognised from her dreams. Lugh was thus conceived.