After the Taiho ritsuryo legal code was enacted, the title 'Dazai no sochi' was established and the Imperial Prince at Third Rank or Fourth Rank or the retainer at Junior Third Rank or sometimes Senior Third Rank were appointed.
大宝律令以後、「大宰帥」の称号が成立し、親王は三品もしくは四品、臣下であれば従三位（場合によっては正三位）が任じられた。