Events 
 January 24 – Pope Gelasius II succeeds Pope Paschal II as the 161st pope.
 March 10 – Gregory VIII is elected antipope.
 June 11 – Roger of Salerno, Prince of Antioch, captures Azaz from the Seljuk Turks.
 December 18 – Alfonso the Battler expels the Moors from Zaragoza.

Europe 
 Þorlákur Runólfsson becomes Bishop of Skálholt.
 Enna mac Donnchada mac Murchada becomes King of Dublin.
 Cu Faifne mac Congalaig becomes King of Ui Failghe.
 Maelsechlainn Ua Faelain becomes King of the Déisi Muman.
 The cantrefs of Rhos and Rhufoniog are annexed by Gruffydd ap Cynan, King of Gwynedd.
 The Archbishop of York is no longer required to be crowned by the Archbishop of Canterbury.
 Reconstruction begins on Peterborough Cathedral, destroyed by fire in 1116.
 Ramon Berenguer III, Count of Barcelona captures Tarragona from the Moors.
 A rebellion against Henry I of England breaks out in Normandy.
 Alberich of Rheims becomes Master at the school of Rheims.
 Charles I, Count of Flanders marries Margaret of Clermont.
 Amaury IV of Montfort divorces his wife Richilde, daughter of Baldwin II, Count of Hainaut.
 Wulgrin III becomes Count of Angoulême.
 Gervais becomes Count of Rethel.
 The castle of Montlhéry is dismantled by Louis VI of France.
 The cathedral of Ferentino is completed.
 Restoration of Santa Maria in Cosmedin begins.
 Magdeburg is almost destroyed by fire.
 Reichenbach Abbey is founded.
 Zwickau, Eisenstadt, Kirchgandern, and Wolfenbüttel are first mentioned.
 Otto of Bamberg is suspended by the Pope, and Norbert of Xanten defends himself against charges of heresy at the Synod of Fritzlar.
 Đorđe, Vojislavljevic´ ruler of Serbia, is overthrown by Uroš I of Raška.
 George of Duklja is overthrown by his cousin Grubeša.
 Radostl becomes Bishop of Krakow.
 Zbraslav, now part of Prague, is founded.
 Sylvestr becomes bishop of Pereyaslavl Yuzhniy.
 The Knights Templar are founded, with Hughes de Payens serving as the first Grand Master.

Asia 
 John II Comnenus succeeds Alexius I as Byzantine emperor.
 The Byzantine general Philocales captures Sardis from the Seljuk Sultanate of Rûm.
 Baldwin I of Jerusalem invades Egypt.
 Baldwin of Le Bourg succeeds his cousin Baldwin I as king of Jerusalem.
 Roman of Le Puy becomes lord of Oultrejordain.
 Joscelin I succeeds Baldwin of Le Bourg as Count of Edessa.
 Garmond of Picquigny becomes Latin Patriarch of Jerusalem.
 Suleyman I ibn al-Ghazi becomes emir of Aleppo.
 David IV of Georgia captures Lorri from the Seljuk Turks.
 David IV of Georgia settles a number of Kipchaks in Georgia.
 Ahmed Sanjar and Mahmud II proclaim themselves rival Seljuk sultans upon the death of Mehmed I of Great Seljuk.
 Al-Mustarshid becomes Abbasid caliph.
 Bahram Shah becomes Ghaznavid emperor.

 The Hoysala Empire defeats the Chalukya at the Battle of Kennagal.
 The Zenghe era of Emperor Huizong of Song China ends, and the Chonghe era begins.
 The Yongning era of Emperor Chongzong of Western Xia ends.
 Start of the Genei era in Japan.

Births 
 November 28 – Manuel I Comnenus, Byzantine Emperor (d. 1180)
 December 21 – Thomas Becket, Archbishop of Canterbury (d. 1170)
 Gualdim Pais, Portuguese Grand-Master of the Templars (d. 1195)
 Eudes II, Duke of Burgundy
 Gertrude, daughter of Lothair III, Holy Roman Emperor and wife of Henry X, Duke of Bavaria
 Christina, daughter of Canute Lavard, wife of Magnus IV of Norway
 Andronicus I Comnenus, Byzantine Emperor (d. 1185)
 Nur ad-Din, ruler of Syria (d. 1174)
 Ahmed ar-Rifa'i, founder of the Rifa'i Sufi order
 Taira no Kiyomori, Japanese general (d. 1181)
 Saigyo, Japanese poet

Deaths 
 January 21 – Pope Paschal II
 April 2 – King Baldwin I of Jerusalem
 April 16 – Adelaide del Vasto, regent of Sicily, mother of Roger II of Sicily, queen of Baldwin I of Jerusalem
 May 1 – Edith of Scotland, queen of Henry I of England
 June 5 – Robert de Beaumont, 1st Earl of Leicester
 July 7 – Florence of Worcester, long thought to be the writer of the chronicle of John of Worcester
 August 15 – Alexius I Comnenus, Byzantine Emperor (b. 1048)
 Gissur Ísleifsson, Bishop of Skálholt
 Muircheartach Ua Briain, High King of Ireland
 Domnall mac Muirchertaig ua Briain, King of Dublin
 Rogan mac Domnaill meic Conchobair, King of Ui Failghe
 William, Count of Évreux
 William III, Count of Angoulême
 Lithuise of Blois
 Milo II, lord of Montlhéry
 Hugh I, Count of Rethel
 Gerberge I, Countess of Provence
 Philip Halsten, King of Sweden
 Maur, Bishop of Krakow
 Basil the Physician, Bogomil leader
 Arnulf of Chocques, Latin Patriarch of Jerusalem
 Mehmed I of Great Seljuk, Seljuk sultan
 Al-Mustazhir, Abbasid caliph
 Arslan Shah, Ghaznavid emperor

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