Most likely the Tai polity of Phrae. The Du-shi fang-yu ji-yao by Gu Zu-yu notes of the polity of Che-li (q.v.), that "to the south it extends to the territory of the Bo-le man (barbarians)" (Gong Yin 1985; 181). Sun Lai-chen (1990) suggests that Bo-le was the Sukothai kingdom. For information on further Chinese sources relating to this polity, see Chen, Xie and Lu (1986; 543-44 and 1021) and Fang Guo-yu (1987; 1021).