 In 1173, Duan sent a party of 23 envoys, led by Li Guanyinde (李觀音得), to trade with the Song dynasty in Hengshan Fort (橫山砦; in present-day Nanning, Guangxi).Li later removed Gao Shouchang (高壽昌), the Duke of Zhong (中國公), from power and replaced him with Gao Zhenming (高貞明; Gao Shouchang's nephew).Aji (阿機) rebelled and ousted Gao Zhenming, restoring Gao Shouchang back in his duke position.