`Nochi no Sanbo' refers to the three; Chikafusa KITABATAKE, Nobufusa MADENOKOJI, Sadafusa YOSHIDA, who served as aides of Emperor Godaigo from the end of Kamakura period to the period of the Southern and Northern Courts.
後の三房（のちのさんぼう）とは、鎌倉時代末期より南北朝時代にかけて、後醍醐天皇の側近として仕えた北畠親房・万里小路宣房・吉田定房の3人の事。