Due to the process above, the generally accepted theory says the Shirakawa family was formed when Akihiro-o returned his family name to "O"; another theory says it was formed by Sukemune-o in the early thirteenth century.
以上の経過により、顕広王の王氏復帰をもって白川家の成立とみなすことが多い（十三世紀初頭の資宗王によって成立したという見解もある）。