Ollathair

Ollathair, known as the Father of the Sky, was an upstart Goa'uld System Lord who visited the Celtic people and took some of them to the planet Newgrange. Though he freed them from the Kings of Tara, he instead placed himself as the ruling god until his disappearance around 500 AD. Though his people did not know it, he had actually been slain by a rival and their planet's address had simply been lost.