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This article is about the year 1240.
|Centuries:||12th century – 13th century – 14th century|
|Decades:||1210s 1220s 1230s – 1240s – 1250s 1260s 1270s|
|Years:||1237 1238 1239 – 1240 – 1241 1242 1243|
|1240 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1240 in poetry|
|Ab urbe condita||1993|
|Bahá'í calendar||−604 – −603|
|English Regnal year||24 Hen. 3 – 25 Hen. 3|
|Chinese calendar||己亥年 (Earth Pig)
3936 or 3876
— to —
庚子年 (Metal Rat)
3937 or 3877
|- Vikram Samvat||1296–1297|
|- Shaka Samvat||1162–1163|
|- Kali Yuga||4341–4342|
|Japanese calendar||En'ō 2 / Ninji 1
|Minguo calendar||672 before ROC
|Thai solar calendar||1783|
|Wikimedia Commons has media related to 1240.|
- Batu Khan and the Golden Horde sack the Ruthenian city of Kiev.
- Tuan Mash'ika, an Arab, travels and introduces Islam to Sulu.
- July 15 – Battle of the Neva: Russian prince Alexander Nevsky defeats the Swedes, saving the Novgorod Republic from a full-scale enemy invasion from the North.
- The civil war era in Norway ends.
- The Flemish village Kaprijke is recognized as a city.
- Sancho II of Portugal conquers the cities of Ayamonte and Cacella over the Muslims as part of the Reconquista.
- Abulafia, Maltese Jewish philosopher (d. 1292)
- Pope Benedict XI (d. 1304)
- Sigerus of Brabant, French theologian (d. 1284)
- Albert the Degenerate, landgrave of Thuringia (approximate date; d. 1314)
- Peter III of Aragon, King of Aragon, Count of Barcelona and King of Valencia, very important monarch. (dead in 1285)
- April 11 – Llywelyn the Great, King of Gwynedd
- November 10 – Ibn Arabi, Andalusian Arab philosopher (b. 1165)
- William de Warenne, 5th Earl of Surrey (b. 1166)