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This article is about the year 1171. For the number, see 1171 (number).
|Centuries:||11th century – 12th century – 13th century|
|Decades:||1140s 1150s 1160s – 1170s – 1180s 1190s 1200s|
|Years:||1168 1169 1170 – 1171 – 1172 1173 1174|
|1171 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1171 in poetry|
|Ab urbe condita||1924|
|Bahá'í calendar||−673 – −672|
|English Regnal year||17 Hen. 2 – 18 Hen. 2|
|Chinese calendar||庚寅年 (Metal Tiger)
3867 or 3807
— to —
辛卯年 (Metal Rabbit)
3868 or 3808
|- Vikram Samvat||1227–1228|
|- Shaka Samvat||1093–1094|
|- Kali Yuga||4272–4273|
|Japanese calendar||Kaō 3 / Jōan 1
|Minguo calendar||741 before ROC
|Thai solar calendar||1714|
|Wikimedia Commons has media related to 1171.|
- Saladin abolishes the Fatimid Caliphate, restoring Sunni rule in Egypt.
- Manuel I Comnenus orders all the Venetians in the Byzantine Empire to be arrested and their property confiscated.
- Rhys ap Gruffydd agrees to negotiate with Henry II of England.
- Construction of the Cathedral of San Sabino in Bari is completed.
- Serbian ruler Stefan Nemanja begins his sole reign.
- Alfonso II of Aragon conquers Caspe and Teruel.
- Henry II of England invades Ireland with the aid of the ousted King of Leinster, Diarmait MacMurrough. As is usual at this time, Henry commandeers merchant ships as part of his invasion. Henry claims the ports of Dublin, Waterford, and Wexford for himself and promises the Irish chieftains protection if they will acknowledge him as their overlord. This begins eight centuries of conflict between Ireland and England.
- Alliance of Pisa and Florence against Lucca and Genoa.
- The successors of Robert Burdet leave Catalonia for Majorca, marking the end of the attempts to create a Norman principality in Iberia.
- August 15 – King Alfonso IX of Leon (d. 1230)
- Agnes of France, daughter of Louis VII of France (d. after 1207)
- January 1 – Diarmait Mac Murchada, King of Leinster (b. 1110)
- February 20 – Conan IV, Duke of Brittany (b. 1138)
- August 8 – Henry of Blois, bishop of Winchester (b. 1111)
- November 8 – Baldwin IV, Count of Hainaut (b. 1108)
- date unknown
- King John by Warren. Published by University of California Press in 1961. p. 121
- King John by Warren. Published by University of California Press in 1961. p. 34
- McGrank, Lawrence (1981). "Norman crusaders and the Catalan reconquest: Robert Burdet and te principality of Tarragona 1129-55". Journal of Medieval History 7 (1): 67–82. doi:10.1016/0304-4181(81)90036-1.