《宋书·志·卷三十五》
后废帝元徽元年，分割南兖州的钟离、豫州的马头，又分割秦郡的顿丘、梁郡的谷熟、历阳的郑，设立新昌郡，又设置徐州，治所仍迁回钟离。
后废帝元徽元年，分南兗州之钟离、豫州之马头，又分秦郡之顿丘、梁郡之谷熟、历阳之酂，立新昌郡，置徐州，还治钟离。
In the first year of Emperor Yuan in the Later Song dynasty, Zhongli in southern Yan prefecture and Matou in Yang prefecture were divided up. The division included the establishment of the new prefecture of Xin Chang and Xu prefecture, with the main office still based in Zhongli.