Further, an article in "Kojiki" (literally, The Records of Ancient Matters) shows that Emperor Richu passed away at the age of 64 'on the third day of the New Year's in the year of Jinshin or Mizunoe-saru (according to the Chinese sexagenary cycle)' (in 432), and if this is correct, he should have reigned from 427 to 432, and as a result of back calculation the year of his birth should be, though uncertain, 369.
また古事記には「壬申年正月三日」に64歳で崩ずとの記事が見え、これが正しければ、在位期間が427年から432年となり、生年が逆算して369年という事になるが、定かではない。