Sumpa is one of the three lineages of the East (smad khams rus rigs gsum), as classified in the 15th century bshad mdzod. The Sumpa were in the north and Tsongon (mtsho sngon) area, and there's a place called Sumpa, associated with the clan, in Amdo. During Songtsen Gampo's time, his minister Nyang Mangpoje Zhangnang won over the Sumpa as the king's subjects without needing to wage war.