According to the "Kojiki," the year of his demise which is 'the seventh month in the year of Teach or Hinoto no ushi (according to the Chinese sexagenary cycle)' corresponds to the year 437 CE, and as a result of back calculation his year of birth corresponds to the year 378 CE, which was nine years after the birth of his elder brother, Emperor Richu.
『古事記』に従えば、崩御した「丁丑年七月」は西暦437年に相当し、生年は逆算して、兄履中天皇より9歳年下の西暦378年に相当するが、定かではない。