《汉书·传·贾邹枚路传》
而当时吴、楚等诸侯王挑选各国的兵众，驱赶着未经训练的士卒，西向与天子争锋，衹有济北王激励节操，坚守城池而不屈服。
今吴、楚之王练诸侯之兵，驱白徒之众，西与天子争衡，济北独底节坚守不下。
But at that time, Kings of feudal states such as Wu and Chu recruited troops from various countries, drove untrained soldiers, and fought westward against the emperor. Only the King of Jibei stimulated integrity, defended the city and refused to yield.