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This article is about the year 855. For the number, see 855 (number). For the area code, see Toll-free telephone number.
|Centuries:||8th century – 9th century – 10th century|
|Decades:||820s 830s 840s – 850s – 860s 870s 880s|
|Years:||852 853 854 – 855 – 856 857 858|
|855 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1608|
|Bahá'í calendar||−989 – −988|
|English Regnal year||N/A|
|Chinese calendar||甲戌年 (Wood Dog)
3551 or 3491
— to —
乙亥年 (Wood Pig)
3552 or 3492
|- Vikram Samvat||911–912|
|- Shaka Samvat||777–778|
|- Kali Yuga||3956–3957|
|Igbo calendar||−145 – −144|
|Japanese calendar||Saikō 2
|Minguo calendar||1057 before ROC
|Thai solar calendar||1398|
|Wikimedia Commons has media related to 855.|
- Louis II succeeds Lothar as Western Emperor. Two other sons, Lothar II and Charles, also get parts of the kingdom.
- The Slavic alphabet is created by Saints Cyril and Methodius.
- Æthelwulf, king of Wessex and Bretwalda, abdicates in favor of his son Æthelbald.
- Edmund becomes king of East Anglia.
- September 29 – Pope Benedict III succeeds Pope Leo IV as the 104th pope.
- Anastasius is made anti-pope by Lothair.
- Æthelwulf of Wessex grants churches in the kingdom of Wessex the right to receive tithes.
- September 29 – Lothar, western emperor (b. 795)
- July 17 – Pope Leo IV
- July 31 – Ahmad ibn Hanbal, Muslim scholar (b. 780)
- November 20 – Theoktistos, chief minister of the Byzantine Empire
- December 8 – Drogo of Metz