《资治通鉴·魏纪·魏纪五》
《周礼》规定，天子可有后妃以下一百二十人，嫔妃的仪制，已经够盛大了。
《周礼》：天子后妃以下百二十人，嫔嫱之仪，既已盛矣。
The "Zhou Li" stipulates that the emperor can have one hundred and twenty people below the imperial concubine, and the etiquette of the concubines is already magnificent.