It is pointed out that the year 673 is the following year of Jinshin War won by the Emperor Tenmu and fell on the 32nd anniversary of the death of his father, the Emperor Jomei, as well as the twelfth anniversary of the death of his mother, the Empress Saime.
673年は天武天皇（大海人皇子）が壬申の乱に勝利した翌年であり、同天皇の父舒明天皇の三十三回忌、母斉明天皇の十三回忌にあたることが指摘されている。