"Yuan Er", who is unknown, Du Fu has a poem "Send Yuan Er to Jiangzuo", and the note says: "Yuan Zeng, Wu (that is, military strategists Sun Wu and Wu Qi) gave it." It may be this man who knows the art of war. "Anxi" and "Anxi" are both protecting the country, and the government ruled in Qiuci, which is now Kuche County, Xinjiang, and is an important town in the Tang Dynasty. In the sixth year of Tianbao (747), Emperor Xuanzong of the Tang Dynasty appointed Gao Xianzhi as our envoy to the four towns of Anxi, and Yuan Er may have sent an envoy to Gao Xianzhi.