(Karameikos: Kingdom of Adventure - Adventure Book, pages 4-17 - "Trouble in Threshold"...specifically pages 13-14 "The Shrine of Key-Hamintep".)
In spite of what is implied above, the Traladarans are actually descended from the Nithans who colonized the area. This, then, becomes one of the first settled sites of the Nithian/Traldar.