《后汉书·本纪·光武帝纪下》
夏四月乙卯，光武帝南巡。皇太子及右翊公刘辅、楚公刘英、东海公刘阳、济南公刘康、东海公刘苍随行，到颍川，进而到叶县、章陵。
夏四月乙卯，南巡狩，皇太子及右翊公辅、楚公英、东海公阳、济南公康、东平公苍从，幸颍川，进幸叶、章陵。
In the fourth month of summer, on Yi Mao, Emperor Guangwu makes a southern inspection. The crown prince and the Right Wing Public Liu Fu, the Chu Public Liu Ying, the East Sea Public Liu Yang, the Ji Nan Public Liu Kang, and the East Sea Public Liu Cang followed him, arriving at Yingchuan, and then to Yexian and Zhangling.