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|855 by topic|
|Ab urbe condita||1608|
|Balinese saka calendar||776–777|
|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||776–777|
|- Kali Yuga||3955–3956|
|Japanese calendar||Saikō 2|
|Minguo calendar||1057 before ROC|
|Seleucid era||1166/1167 AG|
|Thai solar calendar||1397–1398|
981 or 600 or −172
— to —
982 or 601 or −171
|Wikimedia Commons has media related to 855.|
- 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 an Abbasid army, led by the Turkic general Bugha al-Kabir, to suppress an uprising of rebellious Armenian nakharars. He subdues the country, and deports many Armenian nobles to the caliphal capital of Samarra.
- July 17 – Pope Leo IV dies after an 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)
- Guaimar I of Salerno, Lombard prince (approximate date)
- Han Jian, Chinese warlord (d. 912)
- Jing Hao, Chinese painter (d. 915)
- July 17 – Leo IV, pope of the Catholic Church (b. 790)
- September 20 – Gozbald, abbot and bishop of Würzburg
- September 29 – Lothair I, Frankish king and emperor (b. 795)
- November 20 – Theoktistos, Byzantine chief minister
- December 8 – Drogo of Metz, illegitimate son of Charlemagne (b. 801)
- Ahmad ibn Hanbal, Muslim scholar and theologian (b. 780)
- Boso the Elder, count of Turin and Valois
- Cyngen ap Cadell, king of Powys (Wales)
- Elisedd ap Cyngen, king of Powys (Wales)
- Pepin, count of Vermandois (approximate date)
- Sahnun ibn Sa'id, Muslim jurist (or 854)
- Sico II, prince of Salerno (Italy)