《史记·三十世家·梁孝王世家》
袁盎等人入宫谒见太后说： 太后说要立梁王，那么，梁王死后要立谁？ 
袁盎等入见太后： 太后言欲立梁王，梁王即终，欲谁立？ 
Yuan Ang and the others entered the palace to meet the empress dowager and said: The empress dowager said that she wanted to establish the King of Liang, but who should be established after the King of Liang dies?