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|1171 by topic|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1171 in poetry|
|Ab urbe condita||1924|
|Balinese saka calendar||1092–1093|
|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||1092–1093|
|- Kali Yuga||4271–4272|
|Japanese calendar||Kaō 3 / Jōan 1|
|Minguo calendar||741 before ROC|
|Seleucid era||1482/1483 AG|
|Thai solar calendar||1713–1714|
1297 or 916 or 144
— to —
1298 or 917 or 145
|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 Mac Murchada (dies May 1). 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. Ascall mac Ragnaill, last Norse–Gaelic King of Dublin, is captured while trying to retake Dublin from the Cambro-Norman Richard de Clare (Strongbow), perhaps in company with Sweyn Asleifsson, and beheaded; before the end of the year, de Clare relinquishes possession of the city to his own liege lord, Henry.
- Pisa and Florence form an alliance 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 León (d. 1230)
- Agnes of France, Empress consort of the Eastern Roman Empire, daughter of Louis VII of France (d. after 1207)
- February 20 – Conan IV, Duke of Brittany (b. 1138)
- April 3 – Philip of Milly, seventh Grand Master of the Knights Templar (b. c. 1120)
- August 8 – Henry of Blois, bishop of Winchester (b. 1111)
- November 8 – Baldwin IV, Count of Hainaut (b. 1108)
- date unknown