Although some researchers don't agree, the academy claims that the Emperor Tenmu was 55 (56) years old when he passed away and the year of birth should be in 631 if you back-calculate, even though the papers like "Ichidaiyoki" say he was 65 years old, because the academy thinks that the compilers of those papers mistook 55 for 65 in the text-editing operation.
学会では「『一代要記』などの65歳は56歳（同55歳）の写し間違いであり、逆算して631年生まれである」としているが、無理があると反対する研究者もいる。