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- With the support of Muslim troops, the Normans suppress a rebellion on the Sicilian-controlled island of Djerba, and invade the island of Kerkenna.
- August 19 – Baldwin III of Jerusalem takes control of the Kingdom of Jerusalem from his mother Melisende, and also captures Ascalon.
- Andronikos I Komnenos is imprisoned for conspiring against Byzantine emperor Manuel I Komnenos.
- Raynald of Châtillon marries Constance of Antioch, and becomes Prince of Antioch.
- January 6 – Henry of Anjou arrives in England, hoping to dethrone the reigning monarch, Stephen of England, and replace him with Henry's mother, Empress Matilda.
- May 24 – Malcolm IV succeeds his grandfather as King of Scotland at the age of 12, and on May 27 is crowned at Scone Priory.
- November 6 – The Treaty of Wallingford, under the direction of Theobald of Bec, reconciles Stephen of England and Matilda, ending "The Anarchy" which has occurred during their fight for the throne of England. The treaty grants the throne to Stephen for the duration of his life, but makes Matilda's son, Henry of Anjou, the heir apparent.
- The city of Oberglatt (in modern-day Switzerland) is first mentioned in written literature.
- Confronted with important financial difficulty due to the expenses of its Spanish crusade, the Republic of Genoa has to sell its third of the city of Tortosa (which had been conquered in 1148 during that same crusade) to the Count of Barcelona.
- Estimation: Constantinople, capital of the Byzantine Empire, becomes the largest city of the world, taking the lead from Merv in the Seljuk Empire.
- August 17 – William IX, Count of Poitiers (d. 1156)
- Cathal Crobhdearg Ua Conchobair, King of Connacht (d. 1224)
- Sibylla of Acerra, queen dowager regent of Sicily (d. 1205)
- Kamo no Chōmei, a Japanese author, poet (waka), and essayist
- Marco I Sanudo, Duke of the Archipelago (d. 1227)
- May 24 – King David I of Scotland (b. 1084)
- June 29 – Óláfr Guðrøðarson, King of the Isles
- July 8 – Pope Eugene III
- August 16 – Bernard de Tremelay, fourth Grand Master of the Knights Templar (at the Siege of Ascalon)
- August 17 – Eustace IV, Count of Boulogne, son of Stephen, King of England (b. c. 1130)
- August 20 – Bernard of Clairvaux, French churchman (b. 1090)
- December 16 – Ranulf de Gernon, 4th Earl of Chester (b. c. 1100)
- Gilbert de Clare, 1st Earl of Hertford (b. 1115)
- Anna Komnene, Byzantine princess and historian (b. 1083)
- Abulafia, David (1985). The Norman kingdom of Africa and the Norman expeditions to Majorca and the Muslim Mediterranean. Woodbridge: Boydell Press. ISBN 0-85115-416-6.
- Warren, W. L. (1961). King John. Berkeley: University of California Press. p. 21.
- Williams, John B. (1997). "The making of a crusade: the Genoese anti-Muslim attacks in Spain 1146-1148". Journal of Medieval History. 23 (1): 29–53. doi:10.1016/s0304-4181(96)00022-x.
- Geography at about.com
- thePeerage.com – Person Page 407