Emperor Gosanjo was an emperor whose grandfather, for the first time in approximately 170 years, was not from the Northern House of the Fujiwara clan, and his supporters were FUJIWARA no Yoshinobu (Yorimichi's brother by a different mother) and others who were excluded from being eligible for the posts of regent or chancellor even though they were from the same regent's house.
後三条天皇は藤原北家の祖父を持たない約170年ぶりの天皇であり、それを支援したのは同じ摂関家ながらその就任資格から排除された藤原能信（頼通の異母弟）らであった。