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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|
|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|
|Japanese calendar||Saikō 2
|Minguo calendar||1057 before ROC
|Seleucid era||1166/1167 AG|
|Thai solar calendar||1397–1398|
- September 29 – Emperor Lothair I dies after a 15-year reign (co-ruling with his father Louis the Pious until 840). He divides the Middle Frankish Kingdom between his three sons in an agreement called the Treaty of Prüm—the eldest, Louis II receives the northern half of Italy and the title of Holy Roman Emperor. The second, Lothair II receives Lotharingia (the Low Countries and Upper Burgundy). The youngest, Charles receives Lower Burgundy and Provence.
- Spring – King Æthelwulf of Wessex decides to go on a pilgrimage to Rome, accompanied by his youngest son Alfred (age 6) and a large retinue. He divides the kingdom between his two eldest sons, Æthelbald receives the western part of Wessex, while Æthelberht becomes ruler over Kent, Surrey, Sussex and Essex.
- Caliph Al-Mutawakkil sends a Abbasid army led by the Turkic general Bugha al-Kabir to suppress an Armenian uprising of rebellious nakharars. He subdues the country and deports many Armenian nobles to the caliphal capital of Samarra.
- July 17 – Pope Leo IV dies after a 8-year reign and is succeeded by Benedict III as the 104th pope of Rome. Anastasius is made anti-pope by Lothair I.
- Æthelwulf grants churches in Wessex the right to receive tithes. He gives one-tenth of his lands to the Church.
- The Slavic alphabet is created by Saints Cyrill and Methodius.
- Abu'l-Hasan Ali ibn al-Furat, Muslim vizier (d. 924)
- Gerald of Aurillac, Frankish nobleman (approximate date)
- Ahmad ibn Hanbal, Muslim scholar and theologian (b. 780)
- Boso the Elder, count of Turin and Valois
- Cyngen ap Cadell, king of Powys (Wales)
- Drogo of Metz, illegitimate son of Charlemagne (b. 801)
- Gozbald, abbot and bishop of Würzburg
- July 17 – Leo IV, pope of the Catholic Church (b. 790)
- September 29 – Lothair I, Frankish king and emperor (b. 795)
- Pepin, count of Vermandois (approximate date)
- Sahnun ibn Sa'id, Muslim jurist (or 854)
- Sico II, prince of Salerno (Italy)
- November 20 – Theoktistos, Byzantine chief minister