《汉书·纪·文帝纪》
皇上说： 楚王，是朕的叔父，年高德劭，具有丰富的阅历与经验，对治理国事了如指掌。
上曰： 楚王，季父也，春秋高，阅天下之义理多矣，明于国家之体。
The emperor said, “King of Chu is my paternal uncle. He is old, has high moral character, is experienced, and is well-acquainted with the governance of the state.”