With regard to the wives of nobility and samurai warriors, Jugo was first given to MINAMOTO no Rinshi who was a legal wife of FUJIWARA no Michinaga, and TAIRA no Tokiko, who was a legal wife of Chancellor of the State, TAIRA no Kiyomori, while with regard to monks, it was the first example when Jugo was given to the Ninna-ji Hojo, who was a son of the kanpaku (advisor to the emperor) Michiie KUJO and was called Kaidenjugo in the Kamakura period.
貴族・武士の妻に対しては准后は藤原道長の正室・源倫子や、太政大臣平清盛の室平時子が初例であり、僧に対しては、鎌倉時代に関白九条道家の子である仁和寺法助に与えられて開田准后と称されたのが初例となる。