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- 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 on Muhu and 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.
- 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.
- February – William II, Count of Holland
- September 30 – Pope Nicholas IV (d. 1292)
- approximate date – Elisabeth of Bavaria, Queen of Germany (d. 1273)
- 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 2007-09-27.
- 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.