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855 in various calendars
Gregorian calendar	855; DCCCLV
Ab urbe condita	1608
Armenian calendar	304; ԹՎ ՅԴ
Assyrian calendar	5605
Balinese saka calendar	776–777
Bengali calendar	262
Berber calendar	1805
Buddhist calendar	1399
Burmese calendar	217
Byzantine calendar	6363–6364
Chinese calendar	甲戌年 (Wood Dog); 3552 or 3345; — to —; 乙亥年 (Wood Pig); 3553 or 3346
Coptic calendar	571–572
Discordian calendar	2021
Ethiopian calendar	847–848
Hebrew calendar	4615–4616
Hindu calendars
- Vikram Samvat	911–912
- Shaka Samvat	776–777
- Kali Yuga	3955–3956
Holocene calendar	10855
Iranian calendar	233–234
Islamic calendar	240–241
Japanese calendar	Saikō 2; (斉衡２年)
Javanese calendar	752–753
Julian calendar	855; DCCCLV
Korean calendar	3188
Minguo calendar	1057 before ROC; 民前1057年
Nanakshahi calendar	−613
Seleucid era	1166/1167 AG
Thai solar calendar	1397–1398
Tibetan calendar	阳木狗年; (male Wood-Dog); 981 or 600 or −172; — to —; 阴木猪年; (female Wood-Pig); 982 or 601 or −171

Millennium:	1st millennium
Centuries:	8th century; 9th century ; 10th century;
Decades:	830s; 840s; 850s ; 860s; 870s;
Years:	852; 853; 854; 855 ; 856; 857; 858;

Year 855 (DCCCLV) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.

Events

November 20 – Theoktistos, co-regent of the Empire on behalf of 15-year old Emperor Michael III, is murdered on the orders of Michael.

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.^[1] 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.^[2]

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.^[3]

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.^[4]
The Slavic alphabet is created by Saints Cyril and Methodius.

^ Abels 1998, p. 72.
^ Paul Hill (2009). The Viking Wars of Alfred the Great, p. 17. ISBN 978-1-59416-087-5
^ Ter-Ghewondyan 1976, pp. 83–86.
^ Stevenson 1904, p. 186.

Abels, Richard (1998). Alfred the Great: War, Kingship and Culture in Anglo-Saxon England. Harlow, UK: Longman. ISBN 0-582-04047-7.
Stevenson, William Henry (1904). Asser's Life of King Alfred. Oxford, UK: Clarendon Press. OCLC 1354216.
Ter-Ghewondyan, Aram (1976) [1965]. The Arab Emirates in Bagratid Armenia. Translated by Garsoïan, Nina. Lisbon: Livraria Bertrand. OCLC 490638192.