Although junbo was selected from imperial family, there were some exceptions that TAIRA no Seishi, a daughter of TAIRA no Kiyomori, was named as the junbo of Emperor Takakura who was a Kiyomori's nephew-in-law in the end of the Heian Period, and Yasuko HINO, the lawful wife of Yoshimitsu ASHIKAGA, the 3rd Seitaishogun, was named as the junbo of Emperor Gokomatsu in the Muromachi Period.
准母は皇室の中で選ばれるものであったが、平安時代末期に平清盛の娘平盛子が甥の高倉天皇の准母に、室町時代に三代征夷大将軍足利義満の正室であった日野康子が後小松天皇の准母に、それぞれ擬されている例がある。