It is said that Ieyasu sent his daughter, Kazuko to the Imperial Palace because he wished Kazuko to give birth to a Prince for the Tokugawa family to become maternal relatives of the Emperor, however both Princes who were born died young.
家康は徳川家を天皇外戚とするべく皇子誕生の期待を持って和子を宮中に送り込んだ意図があったと考えられているが、出生した2皇子はすべて早世している。