《魏书·帝纪·卷四》
十六日，世祖下诏命大鸿胪卿杜超假节、都督冀定相三州诸军、行征南大将军、太宰，晋爵为王，镇守邺城，为各军节度。
庚子，诏大鸿胪卿杜超假节、都督冀定相三州诸军事、行征南大将军、太宰，进爵为王，镇鄴，为诸军节度。
On the 16th day, Emperor Shizu issued an edict, ordering Minister of the Grand Chamberlains, Du Chao, to perform as a proxy for the Emperor. All the troops of Ji, Ding, and Xiang prefectures shall be under his command. He shall serve as the Acting Great General who Subdues the South, and he shall be made a king and stationed at Ye City, to oversee the military.