1140s

The 1140s was a decade that began on 1 January 1140, and ended on 31 December 1149. It is distinct from the decade known as the 115th decade which began on January 1, 1141 and ended on December 31, 1150.

 Events 
 1142
 End of the reign of Emperor Sutoku, emperor of Japan
 Emperor Konoe becomes Emperor of Japan 
 1143: Celestine II is elected pope. 
 1144: Pope Celestine II is succeeded by Pope Lucius II
 1146: Saint Bernard of Clairvaux preaches the Second Crusade at Vezelay, Burgundy 
 1145–1147: Second Crusade. Crusaders capture Lisbon from Muslims