The origin of `Nochi (later) no Sanbo' came from the fact that the three of wise subordinate; FUJIWARA no Korefusa, OE no Masafusa, FUJIWARA no Tamefusa, who served Emperor Shirakawa during the Heian period had a kanji character of `fusa' (房) in their names, they were called `Mae (previous) no Sanbo.'
平安時代の白河天皇に仕えた名前に「房」の字が付く3人の賢臣(藤原伊房・大江匡房・藤原為房)が、「前の三房」と称された事に因んで命名された。