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|Centuries:||8th century – 9th century – 10th century|
|Decades:||830s 840s 850s – 860s – 870s 880s 890s|
|Years:||866 867 868 – 869 – 870 871 872|
|869 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1622|
|Bahá'í calendar||−975 – −974|
|English Regnal year||N/A|
|Chinese calendar||戊子年 (Earth Rat)
3565 or 3505
— to —
己丑年 (Earth Ox)
3566 or 3506
|- Vikram Samvat||925–926|
|- Shaka Samvat||791–792|
|- Kali Yuga||3970–3971|
|Igbo calendar||−131 – −130|
|Japanese calendar||Jōgan 11
|Minguo calendar||1043 before ROC
|Thai solar calendar||1412|
|Wikimedia Commons has media related to 869.|
- May 26 – An earthquake and tsunami devastate a large part of the Sanriku coast near Sendai, Japan.
- The Zanj (Black slaves from East Africa), provoked by mercilessly harsh labor conditions in the salt flats and on the sugar and cotton plantations of southwestern Persia, revolt.
- Western Emperor Louis II allies with eastern Emperor Basil I against the Saracens.
- Charles the Bald tries to take the kingdom of Lothair II of Lotharingia after the latter's death, but is resisted by Louis the German.
- Repairs are made in Hagia Sophia.
- The Fourth Council of Constantinople (Roman Catholic) (October 5 869–February 28 870) is called to decide action regarding Patriarch Photius of Constantinople. This council is now recognised as Ecumenical by the Catholic Church but rejected by the Eastern Churches. The council of 879-880 rejected the decisions of this council.