Editing 12th century (section)

===[[1140s]]===
[[File:AverroesColor.jpg|thumb|alt=Drawing of a bearded man in Arabic garb|[[Averroes]] in a 14th-century painting by [[Andrea di Bonaiuto da Firenze|Andrea di Bonaiuto]]]]
* [[1140]]–[[1150]]: Collapse of the [[Ancestral Puebloans|Ancestral Puebloan]] culture at [[Chaco Canyon]] (modern-day New Mexico).
* [[1141]]: The [[Treaty of Shaoxing]] ends the conflict between the [[Jin dynasty (1115-1234)|Jin dynasty]] and [[Southern Song dynasty]], legally establishing the boundaries of the two countries and forcing the Song dynasty to renounce all claims to its former territories north of the Huai River. The treaty reduces the Southern Song into a quasi-tributary state of the Jurchen Jin dynasty.
* [[1143]]: [[Manuel I Komnenos]] is crowned as Byzantine emperor after the death of [[John II Komnenos]].
* [[1143]]: [[Afonso Henriques]] is proclaimed King of Portugal by the cortes.
* [[1143]]: The [[Treaty of Zamora]] recognizes Portuguese independence from the Kingdom of León. Portugal also recognizes the suzerainty of the pope.
* [[1144]]: On December 24, [[Siege of Edessa (1144)|Edessa]] falls to the Atabeg [[Nur ad-Din (died 1174)|Zengi]].
* [[1145]]–[[1148]]: The [[Second Crusade]] is launched in response to the fall of the [[County of Edessa]].
* [[1147]]: On October 25, the four-month-long [[Siege of Lisbon]] successfully brings the city under definitive Portuguese control, expelling the Moorish overlords.
* [[1147]]: A new [[Berber people|Berber]] dynasty, the [[Almohads]], led by Emir [[Abd al-Mu'min]], takes North Africa from the [[Almoravides]] and soon invades the [[Iberian Peninsula]]. The Almohads began as a religious movement to rid Islam of impurities.
* [[1147]]: The [[Wendish Crusade]] against the [[Polabian Slavs]] (or "[[Wends]]") in what is now northern and eastern Germany.