1231

Years: 1228 1229 1230 - 1231 - 1232 1233 1234

Decades: 1200s 1210s 1220s - 1230s - 1240s 1250s 1260s

Centuries: 12th century - 13th century - 14th century

Events

*Ardengus becomes bishop of Florence.
* Emperor Frederick II promulgates the Constitutions of Melfi (also known as Liber Augustalis), a collection of laws for Sicily.
* Llywelyn the Great launches a campaign against the Norman lordships in Wales.

Births

* March 17 - Emperor Shijō of Japan (died 1242)
* Guo Shoujing, Chinese astronomer and mathematician
* John de Warenne, 7th Earl of Surrey (died 1304)
* Roger Mortimer, 1st Baron Wigmore (died 1282)

Deaths

* April 6 - William Marshal, 2nd Earl of Pembroke
* June 13 - Anthony of Padua, Portuguese saint (born 1195)
* November 6 - Emperor Tsuchimikado of Japan (born 1196)
* November 17 - Elisabeth of Hungary, daughter of Andrew II of Hungary and saint (born 1207)
* Abd-el-latif, Arab physician and traveller