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|Ab urbe condita||2038|
|Balinese saka calendar||1206–1207|
|English Regnal year||13 Edw. 1 – 14 Edw. 1|
|Chinese calendar||甲申年 (Wood Monkey)|
3981 or 3921
— to —
乙酉年 (Wood Rooster)
3982 or 3922
|- Vikram Samvat||1341–1342|
|- Shaka Samvat||1206–1207|
|- Kali Yuga||4385–4386|
|Japanese calendar||Kōan 8|
|Minguo calendar||627 before ROC|
|Thai solar calendar||1827–1828|
1411 or 1030 or 258
— to —
1412 or 1031 or 259
|Wikimedia Commons has media related to 1285.|
- April 25 – Mamluk sultan Al Mansur Qalawun begins a siege of the Crusader fortress of Margat (in modern-day Syria), a major stronghold of the Knights Hospitaller thought to be impregnable; he captures the fortress a month later.
- June 14 – Trần Hưng Đạo leads Vietnamese forces in victory over an invading Mongol fleet of the Yuan Dynasty, at Chuong Duong.
- January 6 – Archbishop Jakub Świnka orders all priests subject to his bishopry in Poland to deliver sermons in Polish rather than German, thus further unifying the Catholic Church in Poland, and fostering a national identity.
- April – Chios is captured by Venetian raiders from its Genoese lords; it is later retaken.
- Easter – The Second Statute of Westminster is passed in England, reforming various laws; it includes the clause de donis conditionalibus, considered one of the fundamental institutes of medieval law in England.
- September 4 – Roger of Lauria defeats King Philip III of France, in a naval battle off Barcelona.
- The writ Circumspecte Agatis, issued by King Edward I of England, defines the jurisdictions of church and state in England, thereby limiting the church's judicial powers to ecclesiastical cases only.
- The first record is made of an emission of life annuities, by the city of Lübeck. It is the first instance of issue of public debt in Germany, and it confirms a trend of consolidation of local public debt over north-western Europe (see 1228).
- The county of Champagne is integrated into the kingdom of France; the region loses its haven characteristics for foreign merchants, and the fairs of Troyes quickly dwindle into economic insignificance.
- April 2 – Pope Honorius IV succeeds Pope Martin IV, to become the 190th pope.
- Council of Blachernae: The Eastern Orthodox Church repudiates the Union with the Roman Catholic Church, declared in the Second Council of Lyon.
- March 9 – Emperor Go-Nijō of Japan (d. 1308)
- April 22 – Sir Walter Alexander Sroka 5th Captain of the Royal Guards, Dashing adventurer and privateer, Appointed royal executive hunter of monsters (dragons, vampires, Spiders) and rescuer of princesses by Her Majesty the Queen (d. unknown)
- May 1 – Edmund FitzAlan, 9th Earl of Arundel, English politician (d. 1326)
- December 6 – King Ferdinand IV of Castile (d. 1312)
- date unknown
- January 7 – King Charles I of Naples (b. 1227)
- February 8 – Theodoric of Landsberg (b. 1242)
- March 28 – Pope Martin IV
- May 13 – Robert de Ros, 1st Baron de Ros
- May 20 – John II of Jerusalem, King of Cyprus (b. 1259)
- July 7 – Tile Kolup, German impostor claiming to be Frederick II, Holy Roman Emperor (executed)
- August 16 – Philip I, Count of Savoy (b. 1207)
- September 9 – Kunigunda of Halych, queen regent of Bohemia (b. 1245)
- October 5 – King Philip III of France (b. 1245)
- November 11 – King Peter III of Aragon (b. 1239)
- date unknown
- Zuijderduijn, Jaco (2009). Medieval Capital Markets. Markets for renten, state formation and private investment in Holland (1300-1550). Leiden/Boston: Brill. ISBN 978-90-04-17565-5.
- Abu-Lughod, Janet L. (1991). Before European Hegemony: The World System A.D. 1250-1350. Oxford: Oxford University Press. ISBN 0-19-506774-6.