When the first Tsangla people arrived in Pemako they settled in the lower Yarlung valley, surrounded by Kongpopas in the northwest, Pobas in the northeast, and Lhopas in the south. The Tsangla adopted many customs from their neighbors but still retained their original language. Historically, the area came under the rule of Powo (Bomê) kings who ruled the entirety of Pemako (now Medog). During Powo rule, Pemako residents had good relations with the Tibetans. They jointly fought against the Tani (Adis) and Mishmis who regularly disturbed the pilgrimage.