There were various family trees of the past Imperial family such as "Joguki" which recorded the family tree of the Emperor Keitai and others before the establishment of national history by Prince Shotoku which does not exist now.
皇室の歴代や系図の成立過程については、継体の系図を記録した『上宮記』や、現在は伝わらない聖徳太子による国史の成立以前にも各種の系図は存在した。