|Ab urbe condita||1980|
|Balinese saka calendar||1148–1149|
|English Regnal year||11 Hen. 3 – 12 Hen. 3|
|Chinese calendar||丙戌年 (Fire Dog)|
3923 or 3863
— to —
丁亥年 (Fire Pig)
3924 or 3864
|- Vikram Samvat||1283–1284|
|- Shaka Samvat||1148–1149|
|- Kali Yuga||4327–4328|
|Japanese calendar||Karoku 3 / Antei 1|
|Minguo calendar||685 before ROC|
|Thai solar calendar||1769–1770|
1353 or 972 or 200
— to —
1354 or 973 or 201
|Wikimedia Commons has media related to 1227.|
- Livonian Crusade: The Livonian Brothers of the Sword and their crusader allies cross the sea ice from mainland Estonia, and defeat the last Estonian strongholds in the Battle of Muhu and the siege of the Valjala Stronghold in the Saaremaa islands. This marks the end of the Estonian campaign in the Livonian Crusade. The Sword Brothers conquer Danish Estonia, and Tallinn (Reval) is given town rights under Riga law.
- Henry III of England declares himself of age, and assumes power.
- (approximate date) Swedish–Novgorodian Wars: Grand Prince Yaroslav II of Vladimir leads an attack from the Novgorod Republic on Finnic peoples in eastern Fennoscandia, called "Yem", whom he devastates.
- January 11 – The city of Požega is first mentioned, in a charter of Andrew II of Hungary.
- March – England makes a truce with France.
- March 19 – Pope Gregory IX succeeds Pope Honorius III, as the 178th pope.
- July 22 – Battle of Bornhöved, Count Adolf IV of Schauenburg and Holstein defeated King Valdemar II of Denmark
- November 24 – Prince Leszek I the White, High Duke of Poland, is assassinated at an assembly of Piast dukes at Gąsawa.
- Dōgen receives Dharma transmission and inka from his master Rujing in China, settling his "life's quest of the great matter", going on to introduce Sōtō Zen Buddhism into his native Japan.
- March 18 – Pope Honorius III (b. 1148)
- July 23 – Qiu Chuji, Chinese founder of Dragon Gate Taoism (b. 1148)
- August 1 – Shimazu Tadahisa, Japanese warlord (b. 1179)
- August 18 – Genghis Khan, founder of the Mongol Empire (b. c. 1162)
- November 24 – Prince Leszek I the White, High Duke of Poland (b. c. 1186)
- probable date
- Palmer, Alan; Veronica (1992). The Chronology of British History. London: Century Ltd. pp. 79–81. ISBN 0-7126-5616-2.
- "Attack to Finland in 1226". Laurentian Codex (in Swedish). Archived from the original on September 27, 2007.
- Tanahashi, Kazuaki, ed. (1997). Moon In a Dewdrop: Writings of Zen Master Dogen. New York: North Point Press. ISBN 0-86547-186-X.
- Tanahashi, Kazuaki; Loori, Daido (eds.). The True Dharma Eye. Boston: Shambhala.