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Construction of the Uppsala Cathedral begins.
1287 ( ) was a MCCLXXXVII common year starting on Wednesday (link will display the full calendar) of the Julian calendar.
By place [ edit ]
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.
By topic [ edit ]
Arts and culture [ edit ]
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.
Economics [ edit ]
The Italian city of
Siena exacts a forced loan on its taxpayers for the first time, a common feature of medieval public finance. 
Religion [ edit ]
References [ edit ]
^ 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). (2nd ed.). J.M. Newcombe (Boston), Simpkin, Marshall & Co. (London). p. 27. 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. doi: 10.1680/ahotfosl2e.50358. , quoting Stow's chronicle of 1287
^ Lourie, Elena (2004). . Brill. p. 260. Jews, Muslims, and Christians in and around the Crown of Aragon: essays in honour of Professor Elena Lourie ISBN 90-04-12951-0.
^ Catlos, Brian A. (2004). . Cambridge: Cambridge University Press. p. 16. The victors and the vanquished: Christians and Muslims of Catalonia and Aragon, 1050-1300 ISBN 0-521-82234-3.
^ Munro, John H. (2003). "The Medieval Origins of the Financial Revolution". The International History Review. 15 (3): 506–562.