《宋书·列传·卷五十七》
大司马官职最高，另外又当督中外诸军事，而位次在二王的下面，难道不是比皇帝的儿子低一等吗？
大司马位既最高，又都督中外，而次在二王之下，岂非下皇子邪？
The position of the Grand Sima official is the highest, and he is also in charge of all military affairs at home and abroad, but his ranking is lower than the two kings. Is it not lower than the son of the emperor?