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|Ab urbe condita||1966|
|Balinese saka calendar||1134–1135|
|English Regnal year||14 Joh. 1 – 15 Joh. 1|
|Chinese calendar||壬申年 (Water Monkey)|
3909 or 3849
— to —
癸酉年 (Water Rooster)
3910 or 3850
|- Vikram Samvat||1269–1270|
|- Shaka Samvat||1134–1135|
|- Kali Yuga||4313–4314|
|Japanese calendar||Kenryaku 3 / Kenpō 1|
|Minguo calendar||699 before ROC|
|Thai solar calendar||1755–1756|
1339 or 958 or 186
— to —
1340 or 959 or 187
|Wikimedia Commons has media related to 1213.|
- May 15 – King John of England submits to Pope Innocent III, who in turn lifts the interdict of 1208.
- May 30 – Battle of Damme: The English fleet under William Longespée, 3rd Earl of Salisbury, destroys a French fleet off the Belgian port, in the first major victory for the fledgling Royal Navy.
- September 12 – Battle of Muret: The Toulousain and Aragonese forces of Raymond VI of Toulouse and Peter II of Aragon are defeated by the Albigensian Crusade, under Simon de Montfort.
- Jin China is overrun by the Mongols under Genghis Khan, who plunder the countryside and cities, until only Beijing remains free, despite two bloody palace coups and a lengthy siege.
- Pope Innocent III issues a charter, calling for the Fifth Crusade to recapture Jerusalem.
- Mukhali seizes Mi Prefecture and orders all the inhabitants massacred.
- January 18 – Queen Tamar of Georgia (b. c. 1160)
- April 13 – Guy of Thouars, regent of Brittany
- April 21 – Maria of Montpellier, Lady of Montpellier, Queen of Aragon (b. 1182)
- September 12 – King Peter II of Aragon (killed in battle) (b. 1174)
- September 28 – Gertrude of Merania, queen consort regent of Hungary (murdered) (b. 1185)
- October 10 – Frederick II, Duke of Lorraine
- October 14 – Geoffrey Fitz Peter, 1st Earl of Essex
- Sharafeddin Tusi, Persian mathematician (b. 1135)