Since the thema was a front of the Tang Dynasty against Nanzhao, he was able to get his hands on the updated diplomatic and military documents of the two countries. He also lived in Hanoi during his first tenure; therefore he knew some firsthand information of the city, such as trades, deployments, population, etc. As the Nanzhao army sacked the city for the first time, he just escaped from being captured by jumping into the Red River and swimming to the opposite bank. Then he worked under another Jie-du located at Guangzhou where he compiled the first draft of Manshu (Traditional Chinese: ??; Simplified Chinese: ??; pinyin: mánsh?; literally means barbarous document; roughly means the book on the southern tribes). He also worked a second tenure in Hanoi where he finished the book in 862 CE. He died in Guangzhou after retirement. His book Manchu is an invaluable source of the Tang-Nanzhao relation and for anthropological research of Hmong and Vietnam during the later years of the Tang Dynasty. For instance, his eyewitness account on the siege of Hanoi was monumental.
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