《北史·本记·卷三》
三月二十九日，封皇弟禧为咸阳王，干为河南王，羽为广陵王，雍为颍川王，勰为始平王，详为北海王。
三月丙申，封皇弟禧为咸阳王，干为河南王，羽为广陵王，雍为颍川王，勰为始平王，详为北海王。
On the 29th of the third lunar month, the emperor’s younger brothers Xi was made King of Xianyang, Gan King of Henan, Yu King of Guangling, Yong King of Yingchuan, Xie King of Shiping, and Xiang King of Beihai.