1231

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