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 author 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