1284

By area

Africa

• Putting an end to the Bedouin rebellion that had toppled his brother in 1283, Abu Hafs Umar I reconquers Tunis, and reinstalls the Hafsids as the dominating dynasty in Ifriqiya.
• Peter III of Aragon takes advantage of the weakness of the Hafsid Dynasty, and raids the island of Jerba. The Aragonese massacre the population, and occupy the island.

  Asia

• Mamluk sultan of Egypt Al Mansur Qalawun signs a ten-year truce with the Crusader city of Acre; he will violate the truce on various pretexts in 1290.
• The Byzantine city Tralles falls to the Turkish emirate of Menteşe; 20,000 people are led off as slaves.

  Europe

• March 3 - The Statute of Rhuddlan extends English law to Wales.
• June 5 - Battle of the Gulf of Naples: King Charles II of Naples is captured by Roger of Lauria, admiral to King Peter III of Aragon.
• May 18 – Jönköping in Sweden is granted town privileges.
• August 5-6 - Battle of Meloria: The Italian city-state of Genoa defeats its rival Pisa at sea, ending Pisa's marine power and hastening the city's decline in power.
• September 9 - German warlord Trunda makes a campaign to Karelia to tax Karelians but is defeated by Novgorod and the men from Staraya Ladoga.
• King Stefan Dragutin of Serbia receives Belgrade, Syrmia, and other territories from Hungary, when his son marries the king of Hungary's cousin.
• The Kingdom of Germany imposes a trade embargo on Norway, due to the latter pillaging a German ship. The embargo cuts off vital supplies of grain, flour, vegetables and beer, causing a general famine.
• The German city of Hamburg is destroyed by a fire.
• The events giving rise to the story of the Pied Piper of Hamelin take place in Lower Saxony.

  By topic

Arts and culture

• Construction of Beauvais Cathedral is interrupted by a partial collapse of the choir; the event unnerves French masons working in the Gothic style.
• Jean de Meun translates Vegetius' 4th century military treatise De Re Militari from Latin into French.

  Education

• Peterhouse, the oldest collegiate foundation of the University of Cambridge in England, is established by Hugh de Balsham, Bishop of Ely.

  Health

• The al-Mansuri bimaristan is completed in Cairo.

  Markets

• The Republic of Venice begins coining the ducat, a gold coin that is to become the standard of European coinage, for the following 600 years.