On the other hand, in the Japanese Imperial Household in ancient times, the child of an Imperial family member father was allowed to succeed the throne; many children who were born between the male Imperial Family Members and the female subjects ascended to the throne.
しかし古来日本の皇室では、皇位を継承するためには父のみ皇族であればよく、皇族男子と藤原氏など臣民女子との間に生まれた子が即位した例はきわめて多い。