The regime of regent by the Fujiwara clan (Northern House of the Fujiwara clan) was based on the consort clan policy (a policy consisting in making a daughter enter the Imperial Family and making her child an emperor in order to take power as a maternal grandfather).
藤原氏（藤原北家）による摂関政治は、外戚政策（天皇家に子女を入内させ、その子を天皇として外祖父となり権力を握ること）に立脚するものだった。