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1233 in various calendars
Gregorian calendar	1233; MCCXXXIII
Ab urbe condita	1986
Armenian calendar	682; ԹՎ ՈՁԲ
Assyrian calendar	5983
Balinese saka calendar	1154–1155
Bengali calendar	640
Berber calendar	2183
English Regnal year	17 Hen. 3 – 18 Hen. 3
Buddhist calendar	1777
Burmese calendar	595
Byzantine calendar	6741–6742
Chinese calendar	壬辰年 (Water Dragon); 3930 or 3723; — to —; 癸巳年 (Water Snake); 3931 or 3724
Coptic calendar	949–950
Discordian calendar	2399
Ethiopian calendar	1225–1226
Hebrew calendar	4993–4994
Hindu calendars
- Vikram Samvat	1289–1290
- Shaka Samvat	1154–1155
- Kali Yuga	4333–4334
Holocene calendar	11233
Igbo calendar	233–234
Iranian calendar	611–612
Islamic calendar	630–631
Japanese calendar	Jōei 2 / Tenpuku 1; (天福元年)
Javanese calendar	1142–1143
Julian calendar	1233; MCCXXXIII
Korean calendar	3566
Minguo calendar	679 before ROC; 民前679年
Nanakshahi calendar	−235
Thai solar calendar	1775–1776
Tibetan calendar	阳水龙年; (male Water-Dragon); 1359 or 978 or 206; — to —; 阴水蛇年; (female Water-Snake); 1360 or 979 or 207

Millennium:	2nd millennium
Centuries:	12th century; 13th century ; 14th century;
Decades:	1210s; 1220s; 1230s ; 1240s; 1250s;
Years:	1230; 1231; 1232; 1233 ; 1234; 1235; 1236;

Events

War of the Lombards: Lombard forces at Kyrenia surrender to John of Beirut, after a 10-month siege. The defenders, with their personal belongings, are allowed to retire to Tyre. Captured prisoners are exchanged for those held by Richard Filangieri, commander of the Lombards, at Tyre. Cyprus is wholly restored under the rule of the 16-year-old King Henry I ("the Fat"). His vassals are rewarded, and loans that they have made are repaid.^[1]
August 20 – Oath of Bereg: King Andrew II of Hungary vows to the Holy See that he will not employ Jews and Muslims to administer royal revenues, which causes diplomatic complaints and ecclesiastical censures.^[2]
Winter – Reconquista: King Ferdinand III of Castile ("the Saint") conquers the cities of Trujillo and Úbeda. The Castilian army besieges the city of Peniscola. Ferdinand forces Ibn Hud, ruler of the Taifa of Zaragoza, to sign a truce.^[3]

August – Richard Marshal, 3rd Earl of Pembroke, signs an alliance with Llywelyn the Great, to join forces to revolt against King Henry III. Richard is faced by demands from royal bailiffs in September – where the garrison of Usk Castle is forced to surrender.
November – Henry III's army camped at Grosmont Castle is attacked in the night, by a force of Welsh and English rebels. Several of Henry's supporters are captured, and the castle is returned to Hubert de Burgh, one of the rebels.

May 29 – Mongol–Jin War: The Mongol army led by Ögedei Khan captures Kaifeng, capital of the Jin dynasty ('Great Jin'), after the 13-month Mongol siege of Kaifeng. The Mongols plunder the city, while Emperor Aizong of Jin flees for the town of Caizhou. Meanwhile, Ögedei departs and leaves the final conquest to his favoured general, Subutai.
December – Siege of Caizhou: The Mongols under Ögedei Khan besiege Caizhou and ally themselves with the Chinese Song dynasty to eliminate the Jin Dynasty.

Gendt receives its city rights from Otto II ("the Lame"), count of Guelders (modern Netherlands).

Pope Gregory IX establishes the Papal Inquisition, to regularize the persecution of heresy.

January 6 – Matilda of Chester, Countess of Huntingdon (or Maud), English noblewoman (b. 1171)
January 18 – Yang (or Gongsheng), Chinese empress (b. 1162)
February 12 – Ermengarde de Beaumont, queen of Scotland
March 1 – Thomas I (or Tommaso), count of Savoy (b. 1178)
May – Simon of Joinville, French nobleman and knight (b. 1175)
June – Yolanda de Courtenay, queen consort of Hungary
July 8 – Konoe Motomichi, Japanese nobleman (b. 1160)
July 26 – Wilbrand of Oldenburg, prince-bishop of Utrecht
July 27 – Ferdinand (or Ferrand), count of Flanders (b. 1188)
July 29 – Savari de Mauléon, French nobleman (b. 1181)
July 30 – Konrad von Marburg, German priest (b. 1180)
October 8 – Ugo Canefri, Italian health worker (b. 1148)
October 22 – Fujiwara no Shunshi, Japanese empress consort (b. 1209)
November 22 – Helena, duchess of Brunswick-Lüneburg
November 27 – Shi Miyuan, Chinese politician (b. 1164)
Ibn al-Athir, Seljuk historian and biographer (b. 1160)
Bertran de Born lo Filhs, French troubadour (b. 1179)
Bohemond IV ("the One-Eyed"), prince of Antioch (b. 1175)
Gökböri ("Blue-Wolf"), Ayyubid general and ruler (b. 1154)
Guillén Pérez de Guzmán, Spanish nobleman (b. 1180)
John Apokaukos, Byzantine bishop and theologian
Mathilde of Angoulême, French noblewoman (b. 1181)
Sayf al-Din al-Amidi, Ayyubid scholar and jurist (b. 1156)
William Comyn, Scoto-Norman nobleman (b. 1163)

^ Steven Runciman (1952). A History of The Crusades. Vol III: The Kingdom of Acre, pp. 169–170. ISBN 978-0-241-29877-0.
^ Berend, Nora (2001). At the Gate of Christendom: Jews, Muslims and "Pagans" in Medieval Hungary, c. 1000-c.1300. Cambridge University Press. p. 158. ISBN 978-0-521-02720-5.
^ Lourie, Elena (2004). Jews, Muslims, and Christians in and around the Crown of Aragon: essays in honour of Professor Elena Lourie. Brill. p. 270. ISBN 90-04-12951-0.^{[permanent dead link‍]}