In Japan, the Constitution of the Empire of Japan stipulated the heredity of the Imperial throne of the Imperial family (unbroken line), and the heredity of a person's social status such as member of the peerage, warrior class or commoner; the only way to overcome this system of differentiation was through marriage and claiming a connection by blood line.
日本においても大日本帝国憲法下では天皇家の皇位始め（万世一系）、身分（華族・士族・平民）の世襲が定められており、これを打破するには閨閥を繋ぐ他なかった。