In "Kojiki" (The Records of Ancient Matters), there was no name of Kudara no Okimi in Oshisaka no Hikohito no Oenomiko's genealogy in the Emperor Bidatsu's section, it is highly possible that the Kudara no Okimi was Tara no miko (a younger brother-uterine of the Emperor Jomei) who was born to Nukadehime no himemiko ('Ku' in 'Kutara no miko' may have been dropped?); on the other hand, there is another theory saying that he was Kinu no miko (the father of the Emperor Kogyoku and the Emperor Kotoku) born to Omata no miko.
『古事記』敏達段の押坂彦人大兄皇子の系譜に百済王の名は見えず、妃糠手姫皇女所生の多良王（たらのみこ、舒明天皇同母弟）である可能性（「久多良王」の「久」が脱落したか？）が大きいと推察される一方、妃大俣王所生の茅渟王（ちぬのみこ、皇極天皇・孝徳天皇の父）と同一人と推定する説もある。