855
| Years: 851 852 853 854 - 855 - 856 857 858 859 | |
| Decades: 820s 830s 840s - 850s - 860s 870s 880s | |
| Centuries: 8th century - 9th century - 10th century | |
Events
- 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.
- The Slavic alphabet is created by the Saints Cyril and Methodius.
- Ethelwulf, king of Wessex and Bretwalda, abdicates in favor of his son Ethelbald.
- Ethelwulf grants the English churches the right to receive tithes.
- Edmund becomes king of East Anglia.
Births
Deaths
- March 2 - Lothar, western emperor (b. 795)
- July 31 - Ahmad ibn Hanbal Muslim scholar. (b. 780)
- December 8 - Drogo of Metz
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