1171

Events 
 Saladin bans the Fatimid Caliphate, bringing back Sunni rule in Egypt.
 Manuel I Comnenus orders all the Venetians in the Byzantine Empire to be arrested.
 Rhys ap Gruffydd agrees to talk to Henry II of England.
 Building of the Cathedral of Saint Sabino in Bari is finished.
 Serbian ruler Stefan Nemanja begins to rule alone.
 Alfonso II of Aragon beats Caspe and Teruel.
 Henry II of England starts eight centuries of conflict and war between Ireland and England.
 Pisa and Florence make an alliance against Lucca and Genoa.
 The Heirs of Robert Burdet leave Catalonia.

 Births 
 August 15 — King Alfonso IX of León (d. 1230)
 Agnes of France, daughter of Louis VII of France (d. after 1207)

 Deaths 
 January 1 — Diarmait Mac Murchada, King of Leinster (b. 1110)
 February 20 — Conan IV, Duke of Brittany (b. 1138)
 November 8 — Baldwin IV, Count of Hainaut (b. 1108)
 Henry of Blois, bishop of Winchester (b. 1111)
 Gleb of Kiev