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This article is about the year 1243.
|Centuries:||12th century – 13th century – 14th century|
|Decades:||1210s 1220s 1230s – 1240s – 1250s 1260s 1270s|
|Years:||1240 1241 1242 – 1243 – 1244 1245 1246|
|1243 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1243 in poetry|
|Ab urbe condita||1996|
|English Regnal year||27 Hen. 3 – 28 Hen. 3|
|Chinese calendar||壬寅年 (Water Tiger)
3939 or 3879
— to —
癸卯年 (Water Rabbit)
3940 or 3880
|- Vikram Samvat||1299–1300|
|- Shaka Samvat||1165–1166|
|- Kali Yuga||4344–4345|
|Japanese calendar||Ninji 4 / Kangen 1
|Minguo calendar||669 before ROC
|Thai solar calendar||1785–1786|
|Wikimedia Commons has media related to 1243.|
- March – Treaty of Alcaraz, the king of Castile turns the independent Muslim kingdom of Murcia into a protectorate and initiates the process of colonization and christianization of the region. The Castillan troops are garrisoned in Murcia to support the Huddite dynasty (May 1).
- June 25 – Pope Innocent IV succeeds Pope Celestine IV as the 180th pope.
- June 26 – Battle of Köse Dag: The Mongols defeat the Seljuk Turks of Rum.
- The city of Brno is founded in what will become the Czech Republic.
- June 28 – Emperor Go-Fukakusa of Japan (d. 1304)
- September 2 – Gilbert de Clare, 6th Earl of Hertford, English politician (d. 1295)
- James II of Majorca (d. 1311)
- de Epalza, Miguel (1999). Negotiating cultures: bilingual surrender treaties in Muslim-Crusader Spain under James the Conqueror. Brill. p. 88. ISBN 90-04-11244-8.