 There is suspicion that Emperor Keitai (c. AD 500) may have been an unrelated outsider, though the sources (Kojiki, Nihon-Shoki) state that he was a male-line descendant of Emperor Ōjin.However, his descendants, including his successors, were according to records descended from at least one and probably several imperial princesses of the older lineage.The tradition built by those legends has chosen to recognize just the putative male ancestry as valid for legitimizing his succession, not giving any weight to ties through the said princesses.