Emperor Sushun (崇峻天皇) was the 32nd imperial ruler of Japan (587-592). He was the twelfth son of the Emperor Kimmei. His name in birth was Prince Hatsusebe (長谷部皇子, Hatsusebe no miko). His mother Oane no kimi was a daughter of Soga no Iname, the chief of the Soga clan.
He succeeded his brother, Emperor Yomei in 587 with the support of the Soga clan and the Empress Suiko, his sister and the wife of the Emperor Bidatsu. The Mononobe clan attempted to make Prince Anahobe, another son of the Kimmei but failed. The head of the Soga clan, Soga no Umako destroyed Mononobe no Moriya, the head of the clan of Mononobe afterwards, since then the clan of Mononobe declined.
He was assassinated in 592 after losing support of the Soga clan, and the only Emperor who was assassinated through the Japanese history.
The succession of Emperors as described in the Nihon Shoki and the Kojiki cannot be taken at face-value.
Emperor Sujin is believed to have been the first "historical" Emperor (being the first Emperor to rule in the growing Yamato region) after the tribal confederacies that had held power previously--this does not mean, however, that he and those that followed did not have highly ficionalized lives.
This assertion could very well apply to many other early Emperors, while others are most likely composite figures--an amalgamation of various important figures in early Japan.
Japan, which had traditionally been friendly with Paekche, sent a large army; it was crushed, however, in 663, by a T'ang-Silla army at the mouth of the Kum River.
Konin's son, the emperor Kammu, who was of a similar mind, shifted the capital first to Nagaoka and in 794 to Heian (or Heian-kyo; present Kyoto) to sever connections with the temples of Nara and reestablished government in accordance with the ritsuryo system.
Poets represented in the anthology range over all classes of society, from the emperor and members of the imperial family through the aristocracy and the priesthood to farmers, soldiers, and prostitutes; and the scenery celebrated in the verse represents districts throughout the country.