|Ab urbe condita||1982|
|Balinese saka calendar||1150–1151|
|English Regnal year||13 Hen. 3 – 14 Hen. 3|
|Chinese calendar||戊子年 (Earth Rat)|
3925 or 3865
— to —
己丑年 (Earth Ox)
3926 or 3866
|- Vikram Samvat||1285–1286|
|- Shaka Samvat||1150–1151|
|- Kali Yuga||4329–4330|
|Japanese calendar||Antei 3 / Kangi 1|
|Minguo calendar||683 before ROC|
|Thai solar calendar||1771–1772|
1355 or 974 or 202
— to —
1356 or 975 or 203
|Wikimedia Commons has media related to 1229.|
- February 18 – Sixth Crusade: Frederick II signs a ten-year truce with al-Kamil, regaining Jerusalem, Nazareth, and Bethlehem with neither military engagements, nor support from the papacy.
- March 6 (Shrove Tuesday) – The two-year University of Paris strike begins with a student riot.
- March 18 – Sixth Crusade: Frederick II crowns himself King of Jerusalem.
- April 12 – The Treaty of Paris brings the Albigensian Crusade to an end.
- April 23 – Alfonso IX of León conquers Cáceres.
- September 12 – The Catalan-Aragonese army, under the command of James I of Aragon, disembarks at Santa Ponça, Majorca, with the purpose of conquering the island.
- September 13 – Ögedei is proclaimed Khagan of the Mongols, at the Kurultai Council.
- November 28 or November 29 – Battle of Olustra: Erik Eriksson is defeated, and deposed as king of Sweden by Knut Långe, who proclaims himself the new king.
- The Catholic Church permanently establishes the Inquisition, in the charge of the Dominican Order in Rome.
- Beverston Castle, Gloucestershire, England, is founded.
- Following the deadlock tie in the election of the Venetian Doge, the number of electors is increased from 40 to 41 in order to prevent such future occurrences.
- The University of Toulouse is founded in France.
- The city of Turku, Finland is founded.
- The city of Rapperswil is established by Count Rudolf II of Rapperswil.
- January 17 – Albert of Buxhoeveden, German bishop of Riga, crusader
- February 8 – Ali ibn Hanzala, sixth Dāʿī al-Muṭlaq of Tayyibi Isma'ilism
- February 14 – Rǫgnvaldr Guðrøðarson, ousted King of the Isles
- March – Blanche of Navarre, Countess of Champagne, regent of Champagne and Navarre
- date unknown – Yaqut al-Hamawi, Arab biographer and geographer (b. 1179)