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This article is about the year 863. For the number, see 863 (number).
|Centuries:||8th century – 9th century – 10th century|
|Decades:||830s 840s 850s – 860s – 870s 880s 890s|
|Years:||860 861 862 – 863 – 864 865 866|
|863 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1616|
|English Regnal year||N/A|
|Chinese calendar||壬午年 (Water Horse)
3559 or 3499
— to —
癸未年 (Water Goat)
3560 or 3500
|- Vikram Samvat||919–920|
|- Shaka Samvat||785–786|
|- Kali Yuga||3964–3965|
|Igbo calendar||−137 – −136|
|Japanese calendar||Jōgan 5
|Minguo calendar||1049 before ROC
|Thai solar calendar||1406|
|Wikimedia Commons has media related to 863.|
- Constantine I succeeds as king of Scotland (or 862).
- After the death of their brother Charles, Lothair II takes part of the Jura and Louis II takes the Provence.
- Carloman revolts against his father Louis the German a second time.
- The first written record of Smolensk.
- The Christianization of the Rus' Khaganate begins ceasing the dominance of the 63-year-long Rus' Khaganate.
- September 3 – At the Battle of Lalakaon, the East Roman (Byzantine) Empire annihilates an Arab force led by Omar, emir of Melitene. In conjunction with another victory over the Arabs in Armenia, it marks the beginning of the Empire's resurgence, and its counteroffensive against the forces of Islam in the Arab–Byzantine wars.
- The Tang dynasty Chinese author Duan Chengshi writes about Chinese maritime trade in East Africa, and the Arab-run slave trade there.
- Byzantine missionaries Saints Cyril and Methodius come to Great Moravia upon a request of Prince Rastislav.
- Pope Nicholas I excommunicates Patriarch Photios I of Constantinople.
- Ali ibn Yahya al-Armani, Abbasid governor of Armenia and Azerbaijan
- Duan Chengshi
- Karbeas, leader of the Paulicians
- Umar al-Aqta, emir of Melitene