《资治通鉴·汉纪·汉纪十二》
夏季，四月乙巳，汉武帝在太庙册封皇子刘闳为齐王，刘旦为燕王，刘胥为广陵王，从此开始用颁布 诰策 的形式册封诸王。
夏，四月，乙巳，庙立皇子闳为齐王，旦为燕王，胥为广陵王，初作诰策。
In the summer, on the fourth month, Emperor Wu of the Han enfeoffed his sons Liu Hong as King of Qi, Liu Dan as King of Yan, and Liu Xu as King of Guangling in the ancestral temple. From then on, he began to enfeoff princes by issuing edicts.