For broader historical context, see 13th century.

Events

• Robert de Sorbon founds the Collège de Sorbonne at Paris, giving a formal college (and still-common name) to the already existing University of Paris in France.
• Matthew Paris, English historian, personally intreviews King Henry III of England for a week straight while compiling his major work of English history, Chronica Majora.
• King Henry III of England orders the production of an twenty pence English coin of pure gold, the first high-denomination coin minted in England and the first to use gold. Unfortunately for King Henry, the bullion value of the coins was about 20% higher than the nominal face value, leading to poor circulation as coins were melted down by individuals for their gold content.
• The city of Kraków is rebuilt Boleslaus V of Poland after being nearly destroyed in the Tatar invasions in 1241.
• The Japanese Kogen era ends, and the Shoka era begins.

Births

• October 14 - King Przemysl II of Poland
• King Sancho IV of Castile and León
• Beatrice of Burgundy

Deaths

• June 4 - Duke Przemysl I of Poland
• December 24 - John I, Count of Hainaut
• Pho Khun Si Indrathit first king of Sukhothai
• Saint Hyacinth

See also

List of state leaders in 1257