The Changes of the Road from Yizhou to Xizhou in Tang Dynasty
The road from Yizhou(伊州)to Xizhou(西州)in Tang Dynasty underwent a transformation process from south to north.In the early Tang Dynasty,the water environment of Shaer Lake,situated at the heart of the Hami Basin,was particularly favorable.Consequently,people of the Tang Dynasty incorrectly identified Shaer Lake as either Puchang(蒲昌)Lake or Pulei(蒲类)Lake.There was a Yiwu(伊吾)Road passing through the water area of Shaer Lake in the early Tang Dynasty,which was distinct from the later Chiting(赤亭)Road,also known as the Yixi(伊西)Road,and the Xinka(新开)Road,or Yixi North Road.The Yiwu Road was a segment of Xuanzang's(玄奘)Journey to the West,and the Jiaohedao(交河道)Army expanded upon it by developing the Liuzhong(柳中)Road.Following the establishment of Xizhou,the Tang Dynasty utilized Gaochang(高昌)City as the military and political hub to oversee Pulei Lake,progressively developing the road from Puchang County to Luohu(罗护)in Xizhou.After 702,when Beiting(北庭)became the military and political center of the eastern Tianshan Mountains,direct military and administrative communications between the central government and Beiting increased in frequency,leading to the development of a postal road from Nazhi(纳职)County to Luohu in Yizhou.The roads from Puchang County to Luohu and from Nazhi County to Luohu were linked,ultimately forming the postal route from Yizhou to Xizhou.
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