Traveling back to the Liangzhou East Prairie in the early years of the Tang Dynasty, Li Chengmo started out as a herdsman. In a horse-selling conflict, he was kidnapped to Liangzhou City. Because he knew the horse language, he served as a servant of Shen Guo Gong Xiuren and Liang Wang An Xinggui's palace. After hard work, he became the general manager of the palace.
As the conflicts between the Tang Dynasty and the Turks and Tuyuhun deepened, Liangzhou became less and less peaceful. Li Chengmo asked the King of Liang to help quell the war between the two countries, and was allowed.
During the war, Princess Kruluo of Tuyuhun was recovered. Li Chengmo was promoted to the rank of general in Liangzhou due to his military merits, and was finally granted the title of Marquis of the Northwest of the Tang Dynasty by Emperor Taizong of the Tang Dynasty. He went to Ganzhou and the Western Regions to make further achievements.
