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|Ab urbe condita||1607|
|Balinese saka calendar||775–776|
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3550 or 3490
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3551 or 3491
|- Vikram Samvat||910–911|
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|Wikimedia Commons has media related to 854.|
- Emperor Lothair I meets his (half brothers (Louis the German and Charles the Bald) in Attigny (Ardennes) for the third time, to continue the system of "con-fraternal government".
- The Viking chieftains Rorik and Godfrid Haraldsson return to Demark, to gain power after the death of King Horik I. During a civil war, they are forced to go back to Friesland.
- The German city of Ulm is first mentioned in a document by Louis the German. 
- King Æthelwulf of Wessex sends his two youngest sons, Alfred and Æthelred, on a pilgrimage to Rome.
- King Æthelweard of East Anglia dies, and is succeeded by his 14-year-old son Edmund ("the Martyr").
- King Cyngen of Powys makes the first pilgrimage to Rome of a Welsh ruler.
- Viking chieftain Ubba winters in Milford Haven (Wales) with 23 ships.
- Al-Mu'tadid, Muslim caliph (or 861)
- Cadell ap Rhodri, king of Seisyllwg (d. 909)
- Cui Yin, chancellor of the Tang Dynasty (d. 904)
- Muhammad ibn Zakariyā al-Rāzī, Persian philosopher (d. 925)
- Theobald the Elder, Frankish nobleman (d. 942)
- Abu Thawr, Muslim scholar (b. 764)
- Æthelweard, king of East Anglia
- Eanbert, bishop of Lindisfarne
- Horik I, Viking king of Denmark
- Luidger, bishop of Utrecht (approximate date)
- Osburh, queen of Wessex (approximate date)
- Sahnun ibn Sa'id, Muslim jurist (or 855)
- Túathal mac Máele-Brigte, king of Leinster
- Wang Yuankui, Chinese general (b. 812)
- Wigmund, archbishop of York
- Norsemen in the Low Countries: Extracts from the Annales Bertiniani, 855 entry Archived June 14, 2011, at the Wayback Machine.
- Zeit.de: Das Alter der Städte
- ASC 854 - English translation at Project Gutenberg
- Kirby, The Earliest English Kings, p. 161.
- Milford Haven Town Council website History, Chronology of Events Archived March 13, 2012, at the Wayback Machine.