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1140 in various calendars
Gregorian calendar	1140; MCXL
Ab urbe condita	1893
Armenian calendar	589; ԹՎ ՇՁԹ
Assyrian calendar	5890
Balinese saka calendar	1061–1062
Bengali calendar	547
Berber calendar	2090
English Regnal year	5 Ste. 1 – 6 Ste. 1
Buddhist calendar	1684
Burmese calendar	502
Byzantine calendar	6648–6649
Chinese calendar	己未年 (Earth Goat); 3837 or 3630; — to —; 庚申年 (Metal Monkey); 3838 or 3631
Coptic calendar	856–857
Discordian calendar	2306
Ethiopian calendar	1132–1133
Hebrew calendar	4900–4901
Hindu calendars
- Vikram Samvat	1196–1197
- Shaka Samvat	1061–1062
- Kali Yuga	4240–4241
Holocene calendar	11140
Igbo calendar	140–141
Iranian calendar	518–519
Islamic calendar	534–535
Japanese calendar	Hōen 6; (保延６年)
Javanese calendar	1046–1047
Julian calendar	1140; MCXL
Korean calendar	3473
Minguo calendar	772 before ROC; 民前772年
Nanakshahi calendar	−328
Seleucid era	1451/1452 AG
Thai solar calendar	1682–1683
Tibetan calendar	阴土羊年; (female Earth-Goat); 1266 or 885 or 113; — to —; 阳金猴年; (male Iron-Monkey); 1267 or 886 or 114

Millennium:	2nd millennium
Centuries:	11th century; 12th century ; 13th century;
Decades:	1120s; 1130s; 1140s ; 1150s; 1160s;
Years:	1137; 1138; 1139; 1140 ; 1141; 1142; 1143;

Year 1140 (MCXL) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar.

Events

Spring – King Fulk of Jerusalem confronts Imad al-Din Zengi, Seljuk ruler (atabeg) of Mosul, near Dara'a in southern Syria.^[1] Turkish forces under Mu'in al-Din (supported by the Crusaders) besiege Banias.

Spring – King Conrad III enfeoffs Henry II (Jasomirgott), a member of the House of Babenberg, with the County Palatine of the Rhine (belonging to the Holy Roman Empire).
Summer – King Roger II promulgates the Assizes of Ariano (a series of laws to rule the Norman Kingdom of Sicily) after the pacification of southern Italy.
December 21 – Siege of Weinsberg: Conrad III captures the castle at Weinsberg during the civil war between the Staufers and the Welfs in Germany.

Summer – King Stephen appoints Geoffrey de Mandeville as Earl of Essex for his support during the civil war against Matilda (Stephen's cousin).
The town of Lanark in Scotland is made a Royal Burgh by King David I, giving it merchant privileges relating to government and taxation.

August 21 – Jin–Song Wars – Battle of Yancheng: Chinese forces under the command of Yue Fei defeat a numerically superior Jin army led by Wuzhu.

June 3 – Pierre Abelard, a French theologian, is condemned for heresy by the Council of Sens. He sets out for Rome to present his defense to Pope Innocent II.
September 8 – Sephardi Jewish philosopher Judah Halevi, having completed the Kuzari, arrives in Alexandria on a pilgrimage to Palestine.
The first Cistercian monastery in Spain is founded in Fitero.^[2] The order enjoys a rapid expansion in the region in the following 15 years.

Gratian, an Italian monk and canon lawyer, founds the science of Canon law with the publication of the Decretum Gratiani (approximate date).

^ David Nicolle (2009). Osprey: Campaign 204. The Second Crusade 1148: Disaster outside Damascus, p. 15. ISBN 978-184603-354-4.
^ Fletcher, R. A. (1987). "Reconquest and Crusade in Spain c. 1050-1150". Transactions of the Royal Historical Society. 5. 37: 31–47 [45]. doi:10.2307/3679149. JSTOR 3679149. S2CID 154629568.