Emperor of Japan
Currently, the Emperor of Japan is the only head of state in the world with the English title of "Emperor". The Imperial House of Japan is the oldest continuing monarchical house in the world. The historical origins of the Emperors lie in the late Kofun period of the 3rd–7th centuries AD, but according to the traditional account of the "Kojiki" (finished 712) and "Nihon Shoki" (finished 720), Japan was founded in 660 BC by Emperor Jimmu, who was said to be a direct descendant of the sun-goddess Amaterasu. The current Emperor is Akihito. He acceded to the Chrysanthemum Throne upon the death of his father, Emperor Shōwa (Hirohito), in 1989. The Japanese government announced in December 2017 that Akihito will abdicate on 30 April 2019.
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.