In the Tokugawa Shogun family, it became convention since the third shogun, Iemitsu, to obtain midaidokoro (shogun's legitimate wife) from Gosekke (five top Fujiwara families whose members were eligible for the positions of Sessho and Kanpaku) or Miyake (families allowed to be in status of Imperial family); no Midaidokoro from Gosekke or Miyake became the real mother of the next shogun.
徳川将軍家では三代家光以降慣例となった五摂家または宮家出身の御台所（将軍正室）で次期将軍生母となった人物は存在していない。