1257

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

1257 in various calendars

Gregorian calendar	1257 MCCLVII
Ab urbe condita	2010
Armenian calendar	706 ԹՎ ՉԶ
Assyrian calendar	6007
Balinese saka calendar	1178–1179
Bengali calendar	664
Berber calendar	2207
English Regnal year	41 Hen. 3 – 42 Hen. 3
Buddhist calendar	1801
Burmese calendar	619
Byzantine calendar	6765–6766
Chinese calendar	丙辰年 (Fire Dragon) 3954 or 3747     — to — 丁巳年 (Fire Snake) 3955 or 3748
Coptic calendar	973–974
Discordian calendar	2423
Ethiopian calendar	1249–1250
Hebrew calendar	5017–5018
Hindu calendars
- Vikram Samvat	1313–1314
- Shaka Samvat	1178–1179
- Kali Yuga	4357–4358
Holocene calendar	11257
Igbo calendar	257–258
Iranian calendar	635–636
Islamic calendar	654–655
Japanese calendar	Kōgen 2 / Shōka (era) 1 (正嘉元年)
Javanese calendar	1166–1167
Julian calendar	1257 MCCLVII
Korean calendar	3590
Minguo calendar	655 before ROC 民前655年
Nanakshahi calendar	−211
Thai solar calendar	1799–1800
Tibetan calendar	阳火龙年 (male Fire-Dragon) 1383 or 1002 or 230     — to — 阴火蛇年 (female Fire-Snake) 1384 or 1003 or 231

Year 1257 (MCCLVII) was a common year starting on Monday (link will display the full calendar) of the Julian calendar.

Events

• January – Lambsar Castle in Persia is destroyed by the Mongols.
• The Mount Samalas volcano erupts on Lombok Island, Indonesia. One of the largest volcanic eruptions in the past 10,000 years, it creates severe climatic changes across the globe, leading to severe famines and death, and to one of the biggest geo-political changes across the globe over the next few centuries.
• Robert de Sorbon founds the Collège de Sorbonne at Paris, France, 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 an entire week, while compiling his major work of English history, Chronica Majora.
• King Henry III of England orders the production of a 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 is about 20% higher than the nominal face value, leading to poor circulation, as coins are 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 and is granted Magdeburg rights on June 5.
• Władysław Opolski founds the Franciscan monastery in the city of Wodzisław Śląski. Before this date Wodzisław was granted Magdeburg rights (1246-1257).
• The Japanese Kōgen era ends, and the Shōka era begins.
• The Mongols take Dai Viet (northern Vietnam).
• Aberdeen Grammar School is founded in Scotland.
• The Epirote–Nicaean conflict begins.
• Karelians make a campaign to Sweden. The campaign leads Swedish king Valdemar to request Pope Alexander IV to declare a crusade against Karelians, which leads to the third Swedish crusade to Finland.

Births

• October 14 – Przemysł II, king of Poland (d. 1296)
• Beatrice of Burgundy, Lady of Bourbon (d. 1310)

Deaths

• April 28 – Shajar al-Durr, sovereign sultana of Egypt
• June 4 – Duke Przemysł I of Greater Poland (b. 1220/1)
• August 15 – Hyacinth of Poland, friar, "Apostle of the North", canonized (b. c.1185)
• December 24 – John I, Count of Hainaut (b. 1218)