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|878 by topic|
|Ab urbe condita||1631|
|Balinese saka calendar||799–800|
|Chinese calendar||丁酉年 (Fire Rooster)|
3574 or 3514
— to —
戊戌年 (Earth Dog)
3575 or 3515
|- Vikram Samvat||934–935|
|- Shaka Samvat||799–800|
|- Kali Yuga||3978–3979|
|Japanese calendar||Gangyō 2|
|Minguo calendar||1034 before ROC|
|Seleucid era||1189/1190 AG|
|Thai solar calendar||1420–1421|
1004 or 623 or −149
— to —
1005 or 624 or −148
- January 6 – King Alfred the Great is surprised by a Viking attack at Chippenham. He is forced to flee, with his family, into the Somerset Levels for safety. From his headquarters at Athelney, Alfred wages a guerrilla war against the Vikings.
- May – Battle of Edington: Supported by all the levies of Somerset, Wiltshire and Hampshire, Alfred the Great decisively defeats the main body of Danish Vikings, led by King Guthrum, at present-day Edington (near Bratton Castle).
- Treaty of Wedmore: Guthrum agrees to a peace treaty and is baptised, taking the name of Aethelstan. England is divided between Wessex in the south, and the Vikings in the Danelaw up north. Guthrum returns to East Anglia.
- Battle of Cynwit: Viking raiders, led by Ubba Ragnarsson, land on the coast at Combwich with 23 ships, and besiege a hillfort (called Cynwit) at Cannington. Ealdorman Odda launches a surprise attack, and kills Ubba in battle.
- King Rhodri the Great of Gwynedd, Powys and Seisyllwg, returns to his kingdoms, but is killed fighting the Mercians of King Ceolwulf II. His kingdoms are divided amongst his three sons: Anarawd, Merfyn and Cadell.
- King Áed I of Scotland is killed in battle, by his rival Giric mac Dúngal. Giric becomes king of the Picts, and allies himself with Eochaid (grandson of Kenneth I). The two rule all of Alba (Scotland) together as joint-kings.
- May 21 – Siege of Syracuse: The Aghlabids capture the Byzantine fortress city of Syracuse, after a nine-month siege. Most of the population is massacred by the Arabs.
- Zanj Rebellion: The Zanj (black slaves from East Africa) in Mesopotamia seize Wasit (modern Iraq), and establish a presence in the Persian province of Khuzestan.
- King Alfonso III of Asturias conquers the city of Coimbra (modern Portugal), which is under Umayyad reign.
- April 16 – The city of Belgrade is first mentioned in a papal letter to Boris I, ruler (khan) of the Bulgarian Empire.
- September 7 - Pope John VIII crowns Louis the Stammerer as king of the West Frankish Kingdom, in the cathedral at Troyes.
- The excommunication of the later pope Formosus is lifted, after he has promised never to return to Rome.
- Bardas Phokas (the Elder), Byzantine general (d. 968)
- Ermentrude, daughter of Louis the Stammerer (or 875)
- Krishna II, king of Rashtrakuta (India) (d. 914)
- Miró II, Frankish nobleman (approximate date)
- Odo of Cluny, Frankish abbot (approximate date)
- December 31, Seiwa, emperor of Japan (b. 850)
- Abu Zur'a al-Razi, Muslim scholar
- Áed I, king of Alba (Scotland)
- Adelchis, prince of Benevento
- Amoghavarsha I, king of Rashtrakuta (b. 800)
- Anastasius, antipope of Rome (approximate date)
- Gauzfrid, Frankish nobleman
- Iljko, duke (knyaz) of Croatia
- Rhodri the Great, king of Wales
- Run, king of Strathclyde (approximate date)
- Ubba Ragnarsson, Viking chieftain
- Wang Xianzhi, Chinese rebel leader