The first civilization to emerge on Golarion after the Earthfall, the Jistka Imperium quickly became a highly advanced society for the time, both technologically and magically. Their only rival was the burgeoning and aggressive empire of Osirion. The expansionist Pharaohs were eventually able to crush the Imperium with the help of Ahriman. After it’s fall from power, the Jistka Imperium quickly dissolved into wilderness and scattered territories of other empires. It’s ruins still dot much of north-western Garund and are sources of challenge and wealth for many adventurers.
Eventually much of the lands occupied by the Imperium were reunified into the nation of Rahadoum.