Magtireth, designated P9K-429 by the Tau'ri, is a planet in Milky Way galaxy which was once ruled by the Goa'uld System Lord Balor. After Balor's death, Magtireth was taken over by Morrigan. Anubis sent spies to the planet and stole the Eye of Balor from under Morrigan's nose. (RPG: "Living Gods: Stargate System Lords")