The legendary hero Arustun recorded everything he saw and learned during his quest of civilization around the Inner Sea and the Outer Sphere, as well as the legends of his people, in his extensive journals; these were later to be collectively known as the Poleiheira. Arustun returned home from his odyssey in -4120 AR and founded the Jistka Imperium, the first human civilization after the Earthfall. The early government of the Jistka Imperium was based on the Poleiheira.
Sections of Poleiheira were condemned by the rulers of Rahadoum and are now encrypted and known as the Yemalan Codex. Remnants of them have been broken into several folios and are in the hands of various collectors.