《水经注·卷三十》
现在唯阳东南三十里还有杨梁旧城，今名阳亭。俗称缘城是不对的。
今睢阳东南三十里，有故杨梁城，今曰阳亭也，俗名之曰缘城，非矣。
Nowadays, there are still the old city of Yangliang thirty miles southeast of Weiyang, which is now called Yangting. It is wrong to call it Yuancheng.