1257

1257 (MCCLVII) was a common year starting on Monday of the Julian calendar, the 1257th year of the Common Era (CE) and Anno Domini (AD) designations, the 257th year of the 2nd millennium, the 57th year of the 13th century, and the 8th year of the 1250s decade. As of the start of 1257, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.

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

1257 in other 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) 3953 or 3893     — to — 丁巳年 (Fire Snake) 3954 or 3894
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 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

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.

Births

• October 14 – King Przemysł II of Poland (d. 1296)
• Beatrice of Burgundy (died 1310)
• King Sancho IV of Castile and León (died 1295)

Deaths

• June 4 – Duke Przemysł I of Greater Poland
• August 15 – Saint Hyacinth
• December 24 – John I, Count of Hainaut (born 1218)