1264

1264 (MCCLXIV) was a leap year starting on Tuesday of the Julian calendar, the 1264th year of the Common Era (CE) and Anno Domini (AD) designations, the 264th year of the 2nd millennium, the 64th year of the 13th century, and the 5th year of the 1260s decade. As of the start of 1264, 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:	1230s  1240s  1250s  – 1260s –  1270s  1280s  1290s
Years:	1261 1262 1263 – 1264 – 1265 1266 1267

1264 in other calendars

Gregorian calendar	1264 MCCLXIV
Ab urbe condita	2017
Armenian calendar	713 ԹՎ ՉԺԳ
Assyrian calendar	6014
Balinese saka calendar	1185–1186
Bengali calendar	671
Berber calendar	2214
English Regnal year	48 Hen. 3 – 49 Hen. 3
Buddhist calendar	1808
Burmese calendar	626
Byzantine calendar	6772–6773
Chinese calendar	癸亥年 (Water Pig) 3960 or 3900     — to — 甲子年 (Wood Rat) 3961 or 3901
Coptic calendar	980–981
Discordian calendar	2430
Ethiopian calendar	1256–1257
Hebrew calendar	5024–5025
Hindu calendars
- Vikram Samvat	1320–1321
- Shaka Samvat	1185–1186
- Kali Yuga	4364–4365
Holocene calendar	11264
Igbo calendar	264–265
Iranian calendar	642–643
Islamic calendar	662–663
Japanese calendar	Kōchō 4 / Bun'ei 1 (文永元年)
Javanese calendar	1174–1175
Julian calendar	1264 MCCLXIV
Korean calendar	3597
Minguo calendar	648 before ROC 民前648年
Nanakshahi calendar	−204
Thai solar calendar	1806–1807
Tibetan calendar	阴水猪年 (female Water-Pig) 1390 or 1009 or 237     — to — 阳木鼠年 (male Wood-Rat) 1391 or 1010 or 238

Events

• Before May – Second Barons' War, a civil war in England, begins.
• May 12 to May 14 – The Battle of Lewes of the Second Barons' War is fought between Simon de Montfort, 6th Earl of Leicester and King Henry III of England in Sussex. By the end of the battle, de Montfort's forces capture both King Henry and his brother, future King Edward I, making de Montfort the "uncrowned king of England" for 15 months before Edward escapes captivity and recaptures the throne.
• June 18 – The Parliament of Ireland meets at Castledermot in County Kildare, the first definitively known meeting of this Irish legislature.
• In Spain, King James I of Aragon reconquers the cities of Orihuela in Alicante and Elx in Valencia from the Moors, ending over 500 years of Islamic rule.
• The Thuringian War of Succession ends.
• The state of Hesse gains its independence from Thuringia and becomes a free state of the Holy Roman Empire.
• In the Peerage of England, the title Baron de Ros, the oldest continuously held peerage title in England, is created by writ of summons.

Births

• May 26 – Prince Koreyasu, Japanese shogun (died 1326)
• Pope Clement V (died 1314)