Also, for the Michinaga family who fought against Kugyo of other Fujiwara clans and monopolized the positions of Sessho (regent) and Kanpaku (chief advisor to the Emperor), this marriage meant establishment of a necessary collaborative relationship with Kugyo of the Murakami-Genji (the Minamoto clan) who were not in a position to fight against these Fujiwara clans over the Sessho and Kanpaku positions.
またこれは他の藤原氏の公卿と争って摂関の独占を果たした道長一門にとっては藤原氏と摂関の地位を争う立場にはない村上源氏の公卿との連携は不可欠であったという側面もあった。