|Ab urbe condita||2016|
|Balinese saka calendar||1184–1185|
|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||1184–1185|
|- Kali Yuga||4363–4364|
|Japanese calendar||Kōchō 3|
|Minguo calendar||649 before ROC|
|Thai solar calendar||1805–1806|
1389 or 1008 or 236
— to —
1390 or 1009 or 237
|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 inconclusive 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 Age of the Sturlungs.
- 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 from 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)
- Yolande of Dreux, Queen of Scotland (d. 1322)
- January 16 – Shinran Shonin, Japanese founder of the Jodo Shinshu branch of Pure Land Buddhism
- March – Manuel I Megas Komnenos, Emperor of Trebizond
- March 19 – Hugh of Saint-Cher, French cardinal
- November 8 – Matilda of Béthune, French countess
- November 14 – Alexander Nevsky, Grand Prince of Novgorod and Vladimir
- December 16 – King Haakon IV of Norway (b. 1204)
- December 24 – Hōjō Tokiyori, regent of Japan (b. 1227)
- date unknown
- 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 December 20, 2011.