Re: Event of the Year
 

864

July 25 — Edict of Pistres of Charles the Bald orders defensive measures against the Vikings

Re: Event of the Year
 

863

The first written record of Smolensk

Re: Event of the Year
 

862

Fan Chuo finishes his Manchu ("book of the southern tribes").

Re: Event of the Year
 

861

Michael III and Bardas invade Bulgaria.

Re: Event of the Year
 

860

# First siege of Constantinople by the Rus.
# Ethelbert succeeds as king of Wessex.

Re: Event of the Year
 

859

University of Al Karaouine founded in Fez, Morocco. The university is recognized by the Guinness Book of World Records as the oldest university in the world.

Re: Event of the Year
 

858

Patriarch Ignatius is imprisoned and (December 25) deposed to be succeeded by patriarch Photius I.

Re: Event of the Year
 

857

Michael III of Byzantium, under influences of his uncle Bardas, banishes his mother Theodora. Bardas becomes the most powerful person in the empire.

Re: Event of the Year
 

856

Another deadly earthquake strikes Damghan, Iran, killing 200,000 people.

Re: Event of the Year
 

855

# Louis II succeeds Lothar as western emperor. Two other sons, Lothar II and Charles, also get parts of the kingdom.
# September 29 - Pope Benedict III succeeds Pope Leo IV as the 104th pope.
# Anastasius is made anti-pope by Lothair.