That is, FUJIWARA no Ishi, the daughter of FUJIWARA no Sanesue, the fourth, became the biological mother of Emperor Toba and FUJIWARA no Shoshi, the daughter of FUJIWARA no Kinzane, the fifth, became the biological mother of Emperor Sutoku and Emperor Goshirakawa.
すなわち、4代藤原実季の娘藤原苡子は鳥羽天皇の生母、5代藤原公実の娘藤原璋子は崇徳天皇・後白河天皇の生母となった。