《水经注·卷三》
城形椭圆而不方正，汉高帝十一年把它封给武侯宣义，立为侯国。
其城圆长而不方，汉高帝十一年，以封武侯宣义为侯国。
The city is oval in shape and not square, and in the 11th year of Emperor Gaozu of Han, it was given to the Marquis of Wu, Xuan Yi, and established as a vassal state.