title: 858 in Japan
text: # 858 in Japan
  
  Events in the year 858 in Japan.
  
  ## Events
  
  * October 7 – Emperor Montoku dies after an 8-year reign. He is succeeded by his 8-year-old son Seiwa as the 56th emperor of Japan, with Fujiwara no Yoshifusa (Seiwa's grandfather) governing as regent and great minister of the Council of State.
  
  ## Incumbents
  
  * Monarch: Montoku then Seiwa
  
  ## Deaths
  
  * October 7 - Emperor Montoku (born 826)
  