None, formerly advanced
|Under control of||
None, formerly Ancients
|Out of universe information|
P3X-439 is a planet in the Milky Way galaxy, once home to an Ancient colony. Less than a kilometer from the Stargate, a team from Stargate Command found an enormous (and headless, due to its age) colonnade containing a Repository of knowledge at the base.
The Goa'uld Anubis sent a reconnaissance probe to the planet to scout, which discovered the secrets the planet held. SG-1, SG-3, and SG-5 arrived first, narrowly preceding the arrival of Anubis's fleet. Flanked by Death Gliders and Al'kesh, SG-1 destroyed the repository after Colonel Jack O'Neill took the drastic step of interfacing with the device. (SG1: "Lost City, Part 1")