1118

1118 (MCXVIII) was a common year starting on Tuesday of the Julian calendar, the 1118th year of the Common Era (CE) and Anno Domini (AD) designations, the 118th year of the 2nd millennium, the 18th year of the 12th century, and the 9th year of the 1110s decade. As of the start of 1118, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.

• 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.

• 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.

• 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.

• 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

• 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