1233 CE
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. 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. 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, Earl of Kent, one of the rebels.
Conflict & Security
- 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 Siege of Kaifeng (1232). 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.source
- 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.source
- 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, Earl of Kent, one of the rebels.source
- December – Siege of Caizhou: The Mongols under Ögedei Khan besiege Caizhou and ally themselves with the Chinese Song dynasty to eliminate the Jin Dynasty.source
- 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.source
- Gendt receives its city rights from Otto II ("the Lame"), count of Guelders (modern Netherlands).source
- 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.source
Religion & Belief
- 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.source
- Pope Gregory IX establishes the Papal Inquisition, to regularize the persecution of heresy.source
Births
- June/July – Ibn Manzur, Arab lexicographer and writer (d. 1312)source
- August 15 – Philip Benizi de Damiani, Italian religious leader (d. 1285)source
- October – Al-Nawawi, Syrian scholar, jurist and writer (d. 1277)source
- Choe Ui, Korean military leader and dictator (d. 1258)source
- Sancho of Castile, archbishop of Toledo (d. 1261)source
- Adelaide of Burgundy, duchess of Brabant (d. 1273)source
- Ibn al-Quff, Ayyubid physician and surgeon (d. 1286)source
Deaths
- January 6 – Matilda of Chester, Countess of Huntingdon (or Maud), English noblewoman (b. 1171)source
- January 18 – Yang (or Gongsheng), Chinese empress (b. 1162)source
- February 12 – Ermengarde de Beaumont, queen of Scotlandsource
- March 1 – Thomas I (or Tommaso), count of Savoy (b. 1178)source
- May – Simon of Joinville, French nobleman and knight (b. 1175)source
- June – Yolanda de Courtenay, queen consort of Hungarysource
- July 8 – Konoe Motomichi, Japanese nobleman (b. 1160)source
- July 26 – Wilbrand of Oldenburg, prince-bishop of Utrechtsource
- July 29 – Savari de Mauléon, French nobleman (b. 1181)source
- July 30 – Konrad von Marburg, German priest (b. 1180)source
- October 8 – Ugo Canefri, Italian health worker (b. 1148)source
- November 22 – Helena, duchess of Brunswick-Lüneburgsource
- November 27 – Shi Miyuan, Chinese politician (b. 1164)source
- Bohemond IV ("the One-Eyed"), prince of Antioch (b. 1175)source