For this reason, similar to the emperor holding bureaucracy of those below Sankokyukei (three ministers and nine councilors), the Kokyuseido (an institution where an emperor has multiple wives in order to maintain the imperial line) also had a hierarchy where the number of empresses tripled; San (three) fujin, Kyu (nine) no hin, Nijyunana (twenty-seven) no seifu, and Hachijyuichi (eighty-one) no gyosai.
そのため、皇帝が三公九卿以下の官僚組織を擁するのと同様、後宮制度において皇后も三夫人、九嬪、二十七世婦、八十一御妻の3倍ずつ増加するヒエラルキーを擁していた。