Based on this description, there is a theory that characters probably began to be used commonly in the Imperial Court around 600 during the era of Prince Umayado (Prince Shotoku) and that there were no records of characters around the time of the enthronement of Emperor Keitai, which was only remembered as a tradition by the people of the Yamato Dynasty.
この記述を根拠として、朝廷内での文字の常用はおそらく西暦600年前後、厩戸皇子（聖徳太子）の頃であり、継体天皇即位の頃については文字としての記録は無く、口頭での言い伝えとして大和朝廷周辺に記憶があったのみであるとする説もある。