1257

Millennium:	2nd millennium
Centuries:	12th century – 13th century – 14th century
Decades:	1220s 1230s 1240s – 1250s – 1260s 1270s 1280s
Years:	1254 1255 1256 – 1257 – 1258 1259 1260

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 interviews 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 second Genoese War breaks out between Genoa and Venice in Outremer known as the War of Saint Sabas.
The city of Kraków is rebuilt by Boleslaus V of Poland after being nearly destroyed in the Tatar invasions in 1241.
The Japanese Kōgen era ends, and the Shōka era begins.
Mongols take Annam (northern Vietnam).
Aberdeen Grammar School opened.