Kaneyoshi ICHIJO of the Muromachi period recorded that "Saikyuki" is about old ceremonial styles, "Hokuzansho" is about ceremonies during and after the era of Emperor Ichijo, and "Goke-shidai" is about ceremonies during and after the era of Emperor Gosanjo.
室町時代の一条兼良はこの三書を、『西宮記』は古礼、『北山抄』は一条天皇の時代以降の儀式、『江家次第』は後三条天皇の時代以後の儀式と記している。