March 19 – Byzantine–Venetian Treaty: Emperor Michael VIII Palaiologos concludes an agreement with the Republic of Venice. Stipulating a two-year truce, and renewing Venetian commercial privileges in the Byzantine Empire. Michael keeps the Venetians and their fleet from participating in the attempts of Charles I, king of Sicily, to organize an anti-Byzantine crusade, while the Venetians can retain their access to the Byzantine market.[1]
Summer – Uprising of Ivaylo: An uprising under Ivaylo breaks out in northeastern Bulgaria against the failure of Emperor Konstantin Tih to cope with the constant Mongol invasions which have devastated the country for years. Ivaylo confronts and defeats the plundering Mongols, and by autumn all Mongols are driven out of Bulgarian territory. In return, Konstantin gathers a small army and tries unsuccessfully to suppress the revolt but is himself killed in battle.
Late – Battle of Pharsalus: Michael VIII sends a Byzantine expeditionary army under John Synadenos to invade Thessaly. The Byzantines are ambushed and defeated by Greek forces under John I Doukas, Latin ruler of Thessaly, near (Old) Pharsalus. During the battle, Synadenos is captured and Michael Kaballarios, commander of the Latin mercenaries, dies shortly afterward of his wounds.[2]
March – Siger of Brabant, Dutch teacher and philosopher, is condemned by the French Inquisition for his advocacy of the Averroist doctrine that reason is separate from Christian faith.[3]
May 12 – Mehmet I of Karaman, Seljuk vizier, issues a firman (decree) ordering the Turkish language to be used, instead of Arabic or Persian in government offices.
Roger Bacon, Franciscan friar and University of Oxford lecturer, is arrested for spreading anti-Church views; specifically, the Church's stance on Greek philosopher Galen.[7]
Levant
April 15 – Battle of Elbistan: A Mamluk army (some 14,000 men) under Sultan Baibars marches from Syria into the Mongol-dominated Sultanate of Rum and attacks the Mongol occupation force at Elbistan. Baibars, with at least 10,000 horsemen, defeats and overwhelms the Mongol forces. After the battle, he marches unopposed to Kayseri in the heart of Anatolia in triumph and enters the city on April 23.[8]
Migration of the (Southern) Song dynasty: Some 50,000 citizens of the Song dynasty in China become the first recorded inhabitants of Macau, as they seek refuge from the invading armies of the Yuan dynasty. They also stay for a short period in (New) Kowloon.[10]
^Geanakoplos, Deno John (1959). Emperor Michael Palaeologus and the West, 1258–1282: A Study in Byzantine-Latin Relations, p. 297. Cambridge, Massachusetts: Harvard University Press. OCLC101176343.
^Hywel Williams (2005). Cassell's Chronology of World History, p. 148. ISBN0-304-35730-8.
^Runciman, Steven (1958). The Sicilian Vespers: A History of the Mediterranean World in the Later Thirteenth Century, p. 173. Cambridge University Press. ISBN978-1-107-60474-2.
^Amitai-Preiss, Reuven (1995). Mongols and Mamluks: The Mamluk-Illkhanid War, 1260–1281, p. 174. Cambridge University Press, Cambridge. ISBN978-0-521-46226-6.
^Than Tun (1964). Studies in Burmese History (in Burmese). Vol 1. Yangon: Maha Dagon. pp. 136–137.
^Minahan, James B. (2014). Ethnic Groups of North, East, and Central Asia: An Encyclopedia, p. 169. ISBN978-1-61069-017-1.
^Duhem, Pierre (1913). "History of Physics". In Herbermann, Charles (ed.). Catholic Encyclopedia. New York: Robert Appleton Company.
^Geanakoplos, Deno John (1959). Emperor Michael Palaeologus and the West, 1258–1282: A Study in Byzantine-Latin Relations, p. 276. Cambridge, Massachusetts: Harvard University Press. OCLC101176343.
^Markó, László (2006). A magyar állam főméltóságai Szent Istvántól napjainkig: Életrajzi Lexikon [Great Officers of State in Hungary from King Saint Stephen to Our Days: A Biographical Encyclopedia] (in Hungarian). Helikon Kiadó. p. 356. ISBN963-547-085-1.
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