Daishi corresponded to Senior Sixth Rank and Shoshi corresponded to Senior Seventh Rank (Taihorei Kanirei), and until the Kamakura period, it became a practice that Sadaishijoshu was promoted to Fifth Rank and called Taifushi.
大史は正六位、少史は正七位相当であった（同官位令）が、鎌倉時代までに左大史上首が五位に昇る慣例ができ、大夫史と呼ばれた。