1256

For broader historical context, see 1250s and 13th century.

Years: 1253 1254 1255 – 1256 – 1257 1258 1259
Decades: 1220s 1230s 1240s – 1250s – 1260s 1270s 1280s
Centuries: 12th century – 13th century – 14th century 1256 state leaders

Events

The remains of the Hashshashin stronghold at Alamut, which fell in 1256 to the Mongols

April 13 – Pope Alexander IV issues a papal bull constituting the Augustinian monastic order.
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.

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 Kencho era ends, and the Kogen era begins.