1121
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Year 1121 (MCXXI) was a common year starting on Saturday of the Julian calendar.
Events
By place
Byzantine Empire
- Emperor John II Komnenos recovers southwestern Anatolia (modern Turkey) from the Seljuk Turks and then hastens to the Balkans, where the Pechenegs are continuing their incursions. He transfers Byzantine troops to the Danube frontier at Paristrion.
Levant
- Summer – Seljuk forces under Toghtekin make extensive raids into Galilee. King Baldwin II of Jerusalem, in reprisal, crosses the Jordan River with a Crusader army and ravages the countryside. He occupies and destroys a fortress that Toghtekin has built at Jerash.<ref>Steven Runciman (1952). A History of The Crusades. Vol II: The Kingdom of Jerusalem, p. 128. Template:ISBN.</ref>
Europe
- March 2 – Petronilla of Lorraine becomes regent of Holland (Low Countries) after her husband, Floris II ("the Fat") dies. He is succeeded by his 6-year-old son Dirk VI (Theodoric).
- A large rebellion takes place in Córdoba (modern Spain) against the ruling Almoravid dynasty.<ref>Template:Cite book</ref>
England
- January 24 – Adeliza of Louvain, age 17, marries King Henry I of England two months after the accidental death of the heir to the English throne, Henry's only legitimate son, William Adelin.
Eurasia
- Summer – Sultan Mahmud II of the Seljuk Empire declares a Holy War on the Kingdom of Georgia. He sends an expedition under Ilghazi, the Artukid ruler of Mardin, to invade the country.
- August 12 – Battle of Didgori: King David IV ("the Builder") of Georgia with a Georgian army of 55,600 men) defeats the 300,000-strong Seljuk coalition forces at Mount Didgori.
- The much larger Seljuk army is heavily defeated; Georgia is unified and independence is achieved from Muslim authority. King David IV lays siege and captures Tbilisi later in the year assigning it as his capital.
Asia
- Emperor Emperor Huizong of Song sends an expedition to crush the rebellion at Hangzhou (modern-day Zhejiang) in China. The rebels are defeated and their leader Fang La is captured and executed.
By topic
Religion
- Spring – Peter Abelard, a French theologian and philosopher, is condemned and charged with the heresy of Sabellius in a synod at Soissons.<ref>Template:Cite book</ref> Abelard writes Sic et Non.
- April 22 – Antipope Gregory VIII (supported by Emperor Henry V) is arrested by papal troops at Sutri. He is taken to Rome and imprisoned in the Septizonium.
- December 25 (Christmas Day) – The Praemonstratensian Order (Norbertines) is formed, when a group of canons make solemn vows at Prémontré.<ref>Template:Cite web</ref>
- Henry I founds Reading Abbey in England. The Cluniac Order populates the abbey.
- The third and largest church is completed at Cluny Abbey (modern France).<ref>Template:Cite book</ref>
- L'Aumône Abbey is founded by Count Theobald IV of Blois at Loir-et-Cher.<ref name=Santoro>Template:Cite book</ref>
Births
- Ascelina, French Cistercian nun and mystic (d. 1195)
- Chōgen, Japanese Buddhist monk (kanjin) (d. 1206)
- Henry of France, archbishop of Reims (d. 1175)
- Joscelin of Louvain, Flemish nobleman (d. 1180)
- Kojijū, Japanese noblewoman and poet (d. 1202)
Deaths
- January 7 – Erminold, German Benedictine abbot
- January 18 – William of Champeaux, French philosopher
- February 10 – Domnall Ua Lochlainn, Irish king (b. 1048)
- March 2 – Floris II ("the Fat"), count of Holland (b. 1085)
- April 23 – Jón Ögmundsson, Icelandic bishop (b. 1052)
- August 7 – Ulrich I of Passau (or Udalrich), German bishop
- December 11 – Al-Afdal Shahanshah, Fatimid caliph (b. 1066)
- December 13 – Ulrich of Eppenstein, German abbot
- Abd al-Aziz ibn Mansur, Hammadid governor and ruler
- Alfanus II (or Alfano), Lombard archbishop of Salerno
- Al-Tughrai, Persian official, poet and alchemist (b. 1061)
- Bartolf Leslie (or Bartholomew), Scottish nobleman
- Fang La, Chinese rebel leader (executed in Kaifeng)
- Frederick of Liege, German prince-bishop and saint
- Lü Shinang, Chinese religious leader (Manichaean cult)
- Masud Sa'd Salman, Persian poet (approximate date)
- Muireadhach Ua Flaithbheartaigh, Irish king of Iar Connacht
- Robert of Bounalbergo, Norman nobleman and crusader
- Zhou Bangyan, Chinese bureaucrat and ci poet (b. 1056)
- Zhou Tong, Chinese archery teacher and martial artist