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The 1100s decade ran from January 1, 1100, to December 31, 1109. It was the first decade of the 12th century.

The Eastern Hemisphere in 1100 AD

Events and trends

• 1100
  • Henry I becomes King of England.
  • Henry I proclaims the Charter of Liberties, one of the first examples of a constitution.
  • Baldwin I becomes King of Jerusalem.
  • The cities of Kalmar, Kungälv, and Varberg, Sweden are chartered.
  • In Iceland, Althing decides that the laws should be transferred to a written form
  • Approximate date of the invention of checkers.

• 1101
  • Crusade of 1101 occurs

• 1102
  • Coronation of Coloman of Hungary in the town of Biograd, adding the Croatian duchies of Slavonia and Dalmatia to the crown of Hungary (Personal union with Hungary).
  • Crusaders capture Caesarea Maritima.
  • Crusaders defeat an Egyptian invasion of the Kingdom of Jerusalem near Ascalon.

• 1103
  • April 27—Anselm, Archbishop of Canterbury, goes into exile after falling out with Henry I of England
  • Amadeus III becomes Count of Savoy
  • Bohemund I of Antioch is released from imprisonment among the Turks
  • The Scandinavian city of Lund becomes a see within the Roman Catholic Church
  • Sigurd Jorsalfare, Øystein Magnusson and Olav Magnusson become joint kings of Norway.

• 1104
  • September 3—St. Cuthbert reburied in the Durham Cathedral
  • The Venice Arsenal, is founded in Venice.
  • Alfonso I of Aragon becomes King of Aragon and Navarre.
  • Historian Guibert of Nogent becomes abbot of Notre Dame de Nogent.
  • Baldwin I of Jerusalem captures Acre.
  • Baldwin II, count of Edessa, is taken prisoner by the Seljuk Turks at the Battle of Harran; Tancred becomes regent.
  • Kilij Arslan I, Sultan of Rüm, starts a war with the Danishmends.
  • The volcano Hekla erupts in Iceland, destroying settlements

• 1105
  • Henry IV, Holy Roman Emperor deposed by his son, Henry V
  • Tamna kingdom annexed by Korean Goryeo Dynasty.

• 1106
  • Great Comet of 1106 first sighted.[1]
  • September 28—Henry I of England defeats his older brother Robert Curthose, duke of Normandy, at the Battle of Tinchebrai, and imprisons him in Devizes castle; Edgar Atheling and William Clito are also taken prisoner.
  • Balaguer, Spain, is captured from the Moors by the count of Urgell.
  • Boleslaus III of Poland begins a war against his brother Zbigniew for control of Poland.

• 1107
  • Emperor Toba ascends the throne of Japan
  • The great Buddhist centre of learning at Nalanda is destroyed by invaders.
  • Through the Compromise of 1107, suggested by Adela, the sister of King Henry, the Investiture Struggle in England was ended.

• 1108
  • May—Battle of Uclés
  • Consecration of Chichester cathedral.
  • Saint Magnus becomes the first earl of Orkney.
  • In Pistoia, Italy, Cathedral of San Zeno burned to the ground.
  • Alexius I Comnenus and Bohemund I of Antioch negotiate the Treaty of Devol.

• 1109
  • Battle of Naklo
  • Battle of Hundsfeld
  • Battle of Głogów
  • Fulk of Jerusalem becomes count of Anjou
  • Alfonso I of Aragon marries Urraca of Castile
  • Crusaders capture Tripoli
  • Anselm of Laon becomes chancellor of Laon
  • Principality of Nitra ceases to exist after Hungarian King Coloman deposed its last ruler