Ko da yake ikon siyasa a cikin kotu ba da daɗewa ba ya koma gidan Fujiwara, dangin sarakunan kotu waɗanda suka girma kusa da dangin sarauta ta hanyar auren juna. A cikin 858, Fujiwara no Yoshifusa ya bayyana kansa sesshō ("regent") ga Sarkin sarakuna. Dansa Fujiwara no Mototsune ya kirkiro ofishin kampaku, wanda zai iya yin mulki a wurin wani babban sarki mai mulki. Fujiwara no Michinaga, ƙwararren ɗan siyasa wanda ya zama kampakuwara a cikin 996, ya bayyana a lokacin da dangin Fujiwara ke da iko kuma 'ya'yansa mata huɗu sun yi aure ga sarakunan Japan.
Heian-kyō