1256
| Millennium: | 2nd millennium | 
|---|---|
| Centuries: | 12th century – 13th century – 14th century | 
| Decades: | 1220s 1230s 1240s – 1250s – 1260s 1270s 1280s | 
| Years: | 1253 1254 1255 – 1256 – 1257 1258 1259 | 
Events
    
    Europe
    
- May 4 – Pope Alexander IV issues a papal bull Licet ecclesiae catholicae constituting the Augustinian monastic order at Lecceto Monastery.
 - The city of Lviv, in present-day Ukraine, is founded by Danylo King of Rus.
 - Theodore II Lascaris, Byzantine Emperor (in exile in the Empire of Nicaea), successfully concludes a military campaign started a year earlier to recover Thrace from the Bulgarians.
 
Abingdon School is founded. Roger Bacon becomes a Franciscan Friar.
Asia
    
- October – Mongol commander Baiju (operating under Hulagu Khan's command) leads his forces in a victory over Kay Ka'us II of the Sultanate of Rüm, thereby capturing Anatolia.
 - December 15 – Hulagu Khan captures and destroys the Hashshashin stronghold at Alamut in present-day Iran.
 - Hulagu Khan establishes the Ilkhanate dynasty of Persia, which will become one of four main divisions of the Mongol Empire.
 - The Japanese Kenchō era ends, and the Kōgen era begins.
 
Births
    
- January 6 – Gertrude the Great, German mystic
 - Robert, Count of Clermont, French founder of the House of Bourbon (died 1317)
 
- Ibn al-Banna, Arab Mathematician (died 1321)
 
Deaths
    
- January 28 – William II, Count of Holland, King of Germany
 - June 13 – Tankei, Japanese sculptor (born 1173)
 - September 1 – Kujo Yoritsune, Japanese shogun (born 1218)
 - October 14 – Kujo Yoritsugu, Japanese shogun (born 1239)
 - William of Kilkenny, Lord Chancellor of England
 - Johannes de Sacrobosco, English scholar
 
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