|Ab urbe condita||2040|
|Balinese saka calendar||1208–1209|
|English Regnal year||15 Edw. 1 – 16 Edw. 1|
|Chinese calendar||丙戌年 (Fire Dog)|
3983 or 3923
— to —
丁亥年 (Fire Pig)
3984 or 3924
|- Vikram Samvat||1343–1344|
|- Shaka Samvat||1208–1209|
|- Kali Yuga||4387–4388|
|Japanese calendar||Kōan 10|
|Minguo calendar||625 before ROC|
|Thai solar calendar||1829–1830|
1413 or 1032 or 260
— to —
1414 or 1033 or 261
|Wikimedia Commons has media related to 1287.|
- January 30 – Wareru creates the Hanthawaddy Kingdom in modern-day Lower Burma following collapse of the Pagan Kingdom (crowned April 5).
- c. May 14–July 16 – Kublai Khan personally leads a large force to suppress the rebel prince Nayan in Manchuria.
- December – Battle of Pagan: The Theravada Buddhist Pagan Kingdom (in modern-day Myanmar) falls to the invading armies of the Yuan dynasty.
- Kings Mangrai of the Lanna kingdom and Ram Khamhaeng of the Sukhothai Kingdom agree to a peace pact, in their region of southeast Asia (modern-day Thailand).
- Mongol Ilkhan Arghun dispatches Rabban Bar Sauma to the leaders of Europe, to negotiate an alliance against the Muslim states, specifically the Mamluk sultanate of Egypt.
- Mamluk sultan Al-Mansur Qalawun captures the port city of Latakia in present-day Syria.
- January 17 – The Treaty of San Agayz is signed. King Alfonso III of Aragon conquers the island of Menorca from the Moors.
- February – South England flood, affecting the Cinque Ports of England: A storm surge destroys the town of Old Winchelsea on Romney Marsh and nearby Broomhill. The course of the nearby River Rother is diverted away from New Romney, which is almost destroyed, ending its role as a port, with the Rother running instead to the sea at Rye, whose prospects as a port are enhanced. A cliff collapses at Hastings, ending its role as a trade harbour, and demolishing part of Hastings Castle. New Winchelsea is established on higher ground.
- June 8 – Rhys ap Maredudd revolts in Wales; the revolt will not be suppressed until 1288.
- December 14 – A huge storm and associated storm tide in the North Sea and English Channel, known as St. Lucia's flood in the Netherlands, kills thousands and reshapes the coastline of the Netherlands and England.
- In the Netherlands, a fringing barrier between the North Sea and a shallow lake collapses, causing the fifth largest flood in recorded history, which creates the Zuider Zee inlet and kills over 50,000 people; it also gives sea access to Amsterdam, allowing its development as an important port city.
- In England, parts of Norfolk are flooded; the port of Dunwich in Suffolk is further devastated; and in The Fens through the vehemence of the wind and the violence of the sea, the monastery of Spalding and many churches are overthrown and destroyed: "All the whole country in the parts of Holland was for the most part turned into a standing pool so that an intolerable multitude of men, women and children were overwhelmed with the water, especially in the town of Boston, a great part thereof was destroyed."
- King Edward I of England orders the expulsion of Jews from the duchy of Gascony, and confiscates their property.
- The Mongol Golden Horde, led by khan Talabuga and Nogai Khan, attacks Poland for the third time. Lublin, Mazovia, Sandomierz and Sieradz are ravaged by the invaders, who are defeated at Kraków.
- In Aragon, the Uniones, an aristocratic uprising, forces Alfonso III to make concessions to the nobility. In particular, the king grants his barons a bill of rights, known as the Privilegium Generale.
- The Bruntál coat of arms makes its first appearance.
Arts and cultureEdit
- The Altar of St. James in Pistoia Cathedral, Italy – a masterwork of the silversmithing trade containing nearly a ton of silver – is begun; it will not be completed for nearly 200 years.
- The Italian city of Siena exacts a forced loan on its taxpayers for the first time, a common feature of medieval public finance.
- Meynier, Gilbert (2010). L'Algérie cœur du Maghreb classique. De l'ouverture islamo-arabe au repli (658-1518). Paris: La Découverte. p. 163. ISBN 978-2-7071-5231-2.
- History of Yuan.
- Simons, Paul (2008). Since Records Began. London: Collins. ISBN 978-0-00-728463-4.
- Wheeler M.Inst.C.E, William Henry (1896). A History of the Fens of South Lincolnshire, being a description of the rivers Witham and Welland and their estuary, and an account of the Reclamation, Drainage, and Enclosure of the fens adjacent thereto. (2nd ed.). J.M. Newcombe (Boston), Simpkin, Marshall & Co. (London). p. 27. doi:10.1680/ahotfosl2e.50358., quoting Stow's chronicle of 1287
- Lourie, Elena (2004). Jews, Muslims, and Christians in and around the Crown of Aragon: essays in honour of Professor Elena Lourie. Brill. p. 260. ISBN 90-04-12951-0.
- Catlos, Brian A. (2004). The victors and the vanquished: Christians and Muslims of Catalonia and Aragon, 1050-1300. Cambridge: Cambridge University Press. p. 16. ISBN 0-521-82234-3.
- Munro, John H. (2003). "The Medieval Origins of the Financial Revolution". The International History Review. 15 (3): 506–562.