Before the arrival of the Sasinthēnes, several great kingdoms were present across the north of Ōchis, including Nous, spanning Calassy and Noumesia, Naršun, in Hesod, and many others whose names have since been lost to history. About two millennia before the birth of Adanōs, a string of upheavals, revolts, and collapses plunged nearly all into ruin. While any unifying cause of these collapses remains obscure, the arrival of the Near Sea Peoples (who would unify into the Sasinthēnes as they integrated with the native Sagur Hesods) at Ōnavara as raiders and mercenaries is thought to have exacerbated already-dire matters.
In short summary: a peasant leader in Noumesea, who may have been called Kales, led an uprising among the Calassine-speaking undercaste against Sangasa, the king of Nous, which had passed into decline under the depredations of Ōnavarene raids; The first city called Naršun, on the river Laham, was sacked by a combined force of Ōnavarenes and Sagur allies, who had been driven from the country by the king of Naršun. An unknown number of kingdoms at Iantōs and on the Sea of Goent were pushed into decline by constant raiding. Tanthes– a name with no root in Sasinthy– came to primacy as a tributary state to Ōnavara.