1231

Millennium:	2nd millennium
Centuries:	12th century – 13th century – 14th century
Decades:	1200s  1210s  1220s  – 1230s –  1240s  1250s  1260s
Years:	1228 1229 1230 – 1231 – 1232 1233 1234

1231 by topic
Arts, history, and science
Archaeology Architecture Art Literature Poetry Music Science
Countries
Lists of leaders
State leaders Colonial governors Religious leaders
Birth and death categories
Births Deaths
Establishments and disestablishments categories
Establishments Disestablishments
Works category
Works

1231 Media

• 

  Simon de Montfort (c. 1208–1265)

1231 (MCCXXXI) was a common year starting on Wednesday of the Julian calendar, the 1231st year of the Common Era (CE) and Anno Domini (AD) designations, the 231st year of the 2nd millennium, the 31st year of the 13th century, and the 2nd year of the 1230s decade. As of the start of 1231, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.

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