There was a rule that the members from the O clan (the Shirakawa family) served at Ise-jingu Shrine, the members from the Wake clan served at Usa-jingu Shrine and the members of the Fujiwara clan served at Kasuga-taisha Shrine.
伊勢神宮には王氏（白川家）、宇佐神宮には和気氏、春日大社には藤原氏の者が遣わされる決まりであった。