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This article is about the year 1263.
|Centuries:||12th century – 13th century – 14th century|
|Decades:||1230s 1240s 1250s – 1260s – 1270s 1280s 1290s|
|Years:||1260 1261 1262 – 1263 – 1264 1265 1266|
|1263 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1263 in poetry|
|Ab urbe condita||2016|
|Bahá'í calendar||−581 – −580|
|English Regnal year||47 Hen. 3 – 48 Hen. 3|
|Chinese calendar||壬戌年 (Water Dog)
3959 or 3899
— to —
癸亥年 (Water Pig)
3960 or 3900
|- Vikram Samvat||1319–1320|
|- Shaka Samvat||1185–1186|
|- Kali Yuga||4364–4365|
|Japanese calendar||Kōchō 3
|Minguo calendar||649 before ROC
|Thai solar calendar||1806|
|Wikimedia Commons has media related to 1263.|
Northern and eastern Europe
- July – Scottish–Norwegian War: Haakon IV of Norway sets sail to defend the Hebrides against Alexander III of Scotland.
- October 2 – Battle of Largs: an inclusive battle in the Scottish–Norwegian War fought in Scotland, between kings Haakon IV of Norway and Alexander III of Scotland.
- Mindaugas, the only Christian king of Lithuania, is assassinated by his cousin Treniota.
- The chieftains of the eastern part of Iceland become the last to pledge fealty to the King of Norway, bringing a more complete end to the Icelandic Commonwealth and the Icelandic civil war.
- Hulagu Khan is defeated in an attempted invasion north of the Caucasus.
- Based on Magdeburg Law, Żnin (Poland) is given city rights.
- May–July – Battle of Settepozzi: a Venetian fleet defeats a superior Genoese-Byzantine fleet.
- King James I of Aragon conquers Crevillente, Spain from the Moors during the Reconquista.
- Alfonso X of Castile conquers Niebla over Ibn Mahfuz, thus terminating any Muslim presence in the western part of the peninsula.
- Genoa captures the city of Chania on Crete from the Venetians.
Arts and culture
- Edward, heir to the throne of England, seizes £10,000 which had been deposited to the trust of the Knights Templar in London by foreign merchants and English magnates.
- The Bonsignori firm gains the full market of the transfer of fiscal revenue from the papal estates to Rome. 
- Nahmanides, chief rabbi of Catalonia, defends the Talmud in an important disputation against Pablo Christiani before King James I of Aragon.
- The doctrines of theologian Joachim of Fiore are condemned as heresy by the Roman Catholic Church at a synod in Arles.
- January 22 – Ibn Taymiyyah, Syrian philosopher and jurist (d. 1328)
- Theobald II, Duke of Lorraine (d. 1312)
- March 19 – Hugh of Saint-Cher, French cardinal
- September 12 – King Mindaugas of Lithuania
- November 14 – Alexander Nevsky, Grand Prince of Novgorod and Vladimir
- December 15 – King Haakon IV of Norway (b. 1204)
- Hamo de Crevequer, Lord Warden of the Cinque Ports
- Boniface, Count of Savoy
- Hōjō Tokiyori, regent of Japan (b. 1227)
- Boroldai, general of the Golden Horde
- Manuel I Megas Komnenos, Emperor of Trebizond
- Picard, Christophe (2000). Le Portugal musulman (VIIIe-XIIIe siècle. L'Occident d'al-Andalus sous domination islamique. Paris: Maisonneuve & Larose. p. 110. ISBN 2-7068-1398-9.
- Ferris, Eleanor (1902). "The Financial Relations of the Knights Templars to the English Crown". American Historical Review 8 (1).
- Catoni, Giuliano. "BONSIGNORI". Dizionario Biografico degli Italiani. Retrieved 20 December 2011.