After the exclusion of other clans from the Imperial Court was completed by MINAMOTO no Takaakira's expulsion in the Anna Incident and MINAMOTO no Kaneakira's returning to the Imperial family following the incident, a struggle for power was played out within the Northern House of the Fujiwara clan.
安和の変による源高明の追放、次いで源兼明の皇族復帰によって他氏排斥が完了した後は、藤原北家の内部で権力争奪が行われることとなった。