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

1231

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