As the typical examples of 2., FUJIWARA no Moshi who became the Yushi of FUJIWARA no Yoshinobu and married with Emperor Gosanjo to give birth to Emperor Shirakawa, and TAIRA no Tokuko who became the Yushi of the Cloistered Emperor Goshirakawa and married with Emperor Takakura to give birth to Emperor Antoku are well-known.
2．の代表例としては、藤原能信の猶子として後三条天皇に入内して白河天皇を生んだ藤原茂子や後白河法皇の猶子として高倉天皇に入内して安徳天皇を生んだ平徳子などが有名である。