|Ab urbe condita||2037|
|Balinese saka calendar||1205–1206|
|English Regnal year||12 Edw. 1 – 13 Edw. 1|
|Chinese calendar||癸未年 (Water Goat)|
3980 or 3920
— to —
甲申年 (Wood Monkey)
3981 or 3921
|- Vikram Samvat||1340–1341|
|- Shaka Samvat||1205–1206|
|- Kali Yuga||4384–4385|
|Japanese calendar||Kōan 7|
|Minguo calendar||628 before ROC|
|Thai solar calendar||1826–1827|
1410 or 1029 or 257
— to —
1411 or 1030 or 258
|Wikimedia Commons has media related to 1284.|
- 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.
- 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 Mongol Golden Horde, led by Nogai Khan, attacks Hungary a second time.
- The Byzantine city Tralles falls to the Turkish emirate of Menteşe; 20,000 people are led off as slaves.
- 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.
- 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.
Arts and cultureEdit
- 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.
- Peterhouse, the oldest collegiate foundation of the University of Cambridge in England, is established by Hugh de Balsham, Bishop of Ely.
- 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.
- March 24 – Hugh III of Cyprus (b. 1235)
- April – Adelaide of Holland, regent of Holland (b. c.1230)
- April 4 – King Alfonso X of Castile (b. 1221)
- April 20 – Hōjō Tokimune, regent of Japan (b. 1251)
- August 10 – Tekuder, Khan of the Mongol Ilkhanate (executed)
- August 19 – Alphonso, Earl of Chester, son of Edward I of England (b. 1273)
- Meynier, Gilbert (2010). L'Algérie cœur du Maghreb classique. De l'ouverture islamo-arabe au repli (658-1518). Paris: La Découverte. pp. 161–3. ISBN 978-2-7071-5231-2.
- Williams, Hywel (2005). Cassell's Chronology of World History. London: Weidenfeld & Nicolson. pp. 148–150. ISBN 0-304-35730-8.
- Linna, Martti, ed. (1989). Suomen varhaiskeskiajan lähteitä. Historian aitta. p. 138. ISBN 951-96006-1-2.
- "Lecture on Economics in 1284". Stanford University. Archived from the original on September 27, 2011.
- according to the earliest written record, of 1384, in the city records of Hamelin. Harty, Sheila (1994). "Pied Piper Revisited". In Bridges, David; McLaughlin, Terence H. (eds.). Education And The Market Place. Routledge. p. 89. ISBN 0-7507-0348-2.
- "Islamic Culture and the Medical Arts _ Hospitals". Retrieved November 8, 2011.
- "Edward II of England: Biography on Undiscovered Scotland". www.undiscoveredscotland.co.uk. Retrieved March 21, 2019.