Her father was Sessho (regent) at that time, and the imperial marriage of the daughter of active sekkan (regent to the emperor) did not occur for 80 years since Empress FUJIWARA no Kanshi of Emperor Goreizei, and Tadamichi placed hope for Kiyoko and the revival of the Sekkanke (line of regents and advisers).
時に父は摂政で、在任中の摂関の女の入内は、後冷泉天皇の皇后藤原寛子以来、八十年ぶりのことであり、忠通は聖子の入内に摂関家再興の望みを託した。