Records of heads of state
Officially, the current Emperor of Japan, Akihito is the 125th in line from the first emperor Jimmu, who is variously believed to have reigned in the 1st or 7th century BC. The earliest documentary evidence is only for the 29th emperor, Kinmei (AD 509–571); however, this is sufficient such that even the most conservative of estimates still places the Japanese imperial family as among the oldest lines in the world today.
Yasuhira Kiyohara
Seicho Matsumoto (松本 清張, Matsumoto Seicho) was one of the influential writers of the history of modern Japan as well as mysterious novels. In his "Showa Shi Hakkutsu" 『昭和史発掘』,Matsumoto cited what Yasuhira Kiyohara later revealed in 1986, in characterizing the incident, that Kiyohara led his group of soldiers to the front of the Imperial Palace without any machine guns or weapons. Matsumoto saw in this fact that they were so immature and misunderstood Emperor Hirohito. Kiyohara said in a round-table discussion that "it was our program that we enter the Palace with the permission of Emperor Hirohito through Military Officer General to his Majesty Honjo. However, Emperor Hirohito was very furious at our coup d'état."
He wrote a book titled "Konpaku" in which he describes the coup and Chizuko Mifune, a younger sister of his mother.