《水经注·卷十》
衡漳又流经东昌县老城北面，这就是《水经》里说的昌亭，也就是王莽的田昌，俗名叫东相，这是因为相、昌两字音韵相合，因而致误。
衡漳又径东昌县故城北，《经》所谓昌亭也。王莽之田昌也，俗名之曰东相，盖相、昌声韵合，故致兹误矣。
Hengzhang also flows north of the old city of Dongchang, which is Changting in "Shuijing", also known as Tianchang of Wang Mang, commonly known as Dongxiang, because the rhymes of the two words, Xiang and Chang, are the same, hence the error.