1141

• February 2 - The Anarchy in the Kingdom of England - Battle of Lincoln: Robert, 1st Earl of Gloucester and Empress Matilda wrest control of the throne of England from King Stephen, who is captured and imprisoned.
• February 13 - Géza [II of Hungary|Géza II] is crowned King of Hungary and Croatia at age 11, succeeding his father.
• May 14 - Sephardi Jewish philosopher Judah Halevi sets off from Alexandria on a pilgrimage to Palestine.
• September 9 - Battle of Qatwan: Yelü Dashi, founder of the Qara Khitai, defeats the Seljuk Empire and Kara-Khanid forces.
• September 14 - The Anarchy in the Kingdom of England - Rout of Winchester: Empress Matilda returns to the throne, after Robert is captured by loyalist forces.
• November 1 - The Anarchy in the Kingdom of England - Robert, 1st Earl of Gloucester is exchanged by Empress Matilda for King Stephen, who reassumes the throne of England.
• November - The Jin dynasty and Southern Song dynasty sign the Treaty of Shaoxing, and peace in the Jin–Song Wars lasts for the next twenty years. The Huai River is established as the boundary between them.
• The first German colonists arrive in Transylvania, following grants by Geza II of Hungary. The colonization process is completed in 1162.
• The Italian winemaking company Ricasoli is founded.

By topic

Religion

• April 1 - Alberic of Ostia, papal legate to Outremer, solemnly dedicates the Templum Domini in Jerusalem.
• April 2 - In a legatine council convened by Alberic of Ostia in the Templum Domini, the claim of the Latin Patriarch of Antioch over the diocese of Tyre is rejected. Also, a step towards church unity between the Armenian and Latin Church is achieved when the Armenian Catholicos Gregory III makes a profession of faith and promises to restore union with Rome, which is achieved at the end of the century.