Only two such devices are known of by the Tau'ri, one chronicling Apophis' defeat of a rival System Lord, which was seen by Teal'c while he was still in Apophis' service, and another which chronicled the defeat and exile of Phobos by Ares. SG-1 discovered the latter of the devices on a planet which was guarded by Apophis' Serpent Guard and learned of Phobos' fate, and at the same time discovering the Stargate address to Kar'tek, which they would soon visit.