| Millennium: | 1st millennium |
|---|---|
| Centuries: | 8th century – 9th century – 10th century |
| Decades: | 840s 850s 860s – 870s – 880s 890s 900s |
| Years: | 875 876 877 – 878 – 879 880 881 |
| 878 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 878 DCCCLXXVIII |
| Ab urbe condita | 1631 |
| Armenian calendar | 327 ԹՎ ՅԻԷ |
| Bahá'í calendar | -966 – -965 |
| Berber calendar | 1828 |
| Buddhist calendar | 1422 |
| Burmese calendar | 240 |
| Byzantine calendar | 6386 – 6387 |
| Chinese calendar | 丁酉年十一月廿四日 (3514/3574-11-24) — to —
戊戌年十二月初四日(3515/3575-12-4) |
| Coptic calendar | 594 – 595 |
| Ethiopian calendar | 870 – 871 |
| Hebrew calendar | 4638 – 4639 |
| Hindu calendars | |
| - Vikram Samvat | 933 – 934 |
| - Shaka Samvat | 800 – 801 |
| - Kali Yuga | 3979 – 3980 |
| Holocene calendar | 10878 |
| Iranian calendar | 256 – 257 |
| Islamic calendar | 264 – 265 |
| Japanese calendar | |
| Korean calendar | 3211 |
| Thai solar calendar | 1421 |
Events
By place
Europe
- Between 6 and 12 May: Battle of Ethandun (probably either at Edington, Somerset, or Edington, Wiltshire): Alfred the Great of Wessex defeats the Danes of the Danelaw under Guthrum.
- May 21—After a siege of eight months, Syracuse is captured by the Aghlabids of Ifriqiya.
- The Treaty of Wedmore divides England between the Anglo-Saxons and the Danes.
- Rhodri, the first King of Wales to be known as "the Great", is killed in battle.
- The city of Belgrade is first mentioned.
- Eochu MacRunn and Girig MacDungal jointly succeed Aed I of Scotland.
By topic
Religion
- The excommunication of the later Pope Formosus is lifted.
Births
Deaths
- Aedh MacRunn, King of the Scots and Picts
- Rhodri Mawr, king of Wales
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