《宋书·志·卷十五》
尚书令建童工刘休仁议论说： 按礼制裹说，妃妾既不能与君主同体，她的职位品级应该参照她儿子的地位而排定位次。
尚书令建安王休仁议称： 礼云，妾既不得体君，班秩视子为序。
Liu Xiuren, Shangshu Lingjian Tonggong, argued: according to the system of rituals, since a concubine cannot be considered one entity with the monarch, her position and rank should be based on her son's status.