Alteran

The Alterans were an extraterrestrial species from the planet of Celestis in the Alteran Home Galaxy that evolved millions of years ago. Because of a philosophical disagreement, they would eventually split into two factions: the Ancients/Ancestors/Lanteans and Ori, where the Ancients went to Milky Way which they called Avalon and the Ori remained in the original galaxy. In their later history, they seeded human life in their respective galaxies, especially the Ori.