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This article is about the year 871. For the number, see 871 (number).
|Centuries:||8th century – 9th century – 10th century|
|Decades:||840s 850s 860s – 870s – 880s 890s 900s|
|Years:||868 869 870 – 871 – 872 873 874|
|871 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1624|
|Chinese calendar||庚寅年 (Metal Tiger)
3567 or 3507
— to —
辛卯年 (Metal Rabbit)
3568 or 3508
|- Vikram Samvat||927–928|
|- Shaka Samvat||793–794|
|- Kali Yuga||3972–3973|
|Japanese calendar||Jōgan 13
|Minguo calendar||1041 before ROC
|Seleucid era||1182/1183 AG|
|Thai solar calendar||1413–1414|
|Wikimedia Commons has media related to 871.|
- Nine battles are fought between the Danes and Wessex. Of two of them the place and date are not recorded, the others are:
- February 2 – Louis II captures Bari, the headquarters of the Saracens.
- Alfred the Great succeeds as king of Wessex after Ethelred's death.
- Reading, England is occupied by the Norse.
- After the battle at Wilton, peace is made, with the Danes and Alfred each governing part of England.
- Rhodri Mawr ('the Great') of Gwynedd inherits Seisyllwig, thus uniting most of Wales under his rule.
- Alfred makes Winchester his capital.
- An incomplete marriage contract, dated to October 6 of this year, is the earliest dated document in the Cairo Geniza.
- Tønsberg, the oldest surviving town in the Nordic countries, is founded.
- Svatopluk I becomes king of Great Moravia.
- Abu Bakr Muhammad ibn Ali al-Madhara'i, senior official of the Tulunid, Abbasid and Ikhshidid dynasties (d. 957)
- Thrand, Jarl of Sula, Sweden
- January 8 – King Bagsecg, Viking leader (at the Battle of Ashdown)
- April 23 – King Ethelred of Wessex (in battle)