Uremite Migrations into Rhydain

The Uremite migrations to Rhydain occurred in several major waves over the two centuries following the Great Cataclysm and the collapse of Qossite power around the Sarpic Seas. Tribal kingdoms in southern Urem, which had long been locked into tributary status under the domination of the Sorcerer-Kings, were finally free; many sought to expand or conquer their neighbors, and many wars were fought. Tribes were defeated and absorbed, or forced off their ancestral lands by the aggression of more powerful neighbors. This drove further tribal movements in a series of chain reactions, as one dispossessed group might invade the territory of a still-weaker neighbor to claim it as their new home, dispossessing that weaker tribe in turn, and so forth. 
This pattern of migration and warfare inevitably pushed many Uremites to take to the sea (most often from the Phoacian coast, or from the shores of the [XXXXXXXX bay between Thiatia and Ekhroa]) and cross south into eastern Rhydain. The majority of them made for the Modrinian coastline or sailed up the River Helvander itself, since it gave access to the wide fertile plain of the lower Helvanderûn and beyond it the fruitful country of the whole Taefemach. Their arrival of course sparked conflict with the native Brecai people, but also led to trade and intermarriage in time. In some areas they were actually welcomed, since their arrival meant more warriors to help defend against the waves of orcish marauders being driven down from the eastern Adhemars by Kuzul-Kadrin's expansion into those ranges. 
These migrations gradually ended as the Asgali Empire rose to dominate Rhydain, becoming strong enough to defend its shores and turn back foreign encroachments (and to finally exterminate the orcs forced down from the mountains). Areas of the Taefemach that had been settled by Uremites were absorbed and integrated, and lost their distinctive character over many generations of Asgali rule. The legacy of these migrations is the mixed Uremite-Brecai ancestry of many of the Taefemach's inhabitants, in contrast to the more pure-blooded Brecai origins of, say, the Tythians or Koerdians.