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This article is about the year 1234. For other uses, see 1234 (disambiguation).
|Centuries:||12th century – 13th century – 14th century|
|Decades:||1200s 1210s 1220s – 1230s – 1240s 1250s 1260s|
|Years:||1231 1232 1233 – 1234 – 1235 1236 1237|
|1234 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1234 in poetry|
|Ab urbe condita||1987|
|English Regnal year||18 Hen. 3 – 19 Hen. 3|
|Chinese calendar||癸巳年 (Water Snake)
3930 or 3870
— to —
甲午年 (Wood Horse)
3931 or 3871
|- Vikram Samvat||1290–1291|
|- Shaka Samvat||1156–1157|
|- Kali Yuga||4335–4336|
|Japanese calendar||Tenpuku 2 / Bunryaku 1
|Minguo calendar||678 before ROC
|Thai solar calendar||1776–1777|
|Wikimedia Commons has media related to 1234.|
- The Manden region rises against the Kaniaga kingdom. This is the beginning of a process that will lead to the rise of the Mali empire.
- February 9 – Mongol conquest of the Jin dynasty: In the Siege of Caizhou, Song Dynasty Chinese and Mongolian armies occupy the Jurchen capital at Caizhou and the Emperor Aizong of Jin commits suicide, marking the collapse of the Jin dynasty.
- Upon the death of Knut Långe, the deposed Erik Eriksson returns as king of Sweden, possibly after a small war between the two of them. It is also possible that Knut dies of natural causes and Erik peacefully then returns as king.
- Pope Gregory IX calls for a crusade against Bosnia, and replaces the Bogumil Bosnian Bishop with a Catholic Dominican German, Johann.
- King Andrew II of Hungary proclaims herzeg Coloman as Ban of Bosnia, who passes it on to Prijezda, a cousin of Ban Matej Ninoslav (1234 to 1239), despite Matej being the legitimate Ban of Bosnia.
- Sancho II of Portugal conquers the cities of Aljustrel and Mértola over the Muslims.
- Saint Dominic is canonized.
- Pope Gregory IX releases the Nova Compilatio Decretalium or Decretales Gregorii IX.
- April 16 – Richard Marshal, 3rd Earl of Pembroke (b. 1191)
- June 18 – Emperor Chūkyō of Japan (b. 1218)
- August 31 – Emperor Go-Horikawa of Japan (b. 1212)
- Alan, Lord of Galloway
- Stefan Radoslav, King of Serbia (b. 1192)
- Knut Långe, usurper to the Swedish throne since 1229