This article needs additional citations for verification. (August 2017)
|Ab urbe condita||2048|
|Balinese saka calendar||1216–1217|
|English Regnal year||23 Edw. 1 – 24 Edw. 1|
|Chinese calendar||甲午年 (Wood Horse)|
3992 or 3785
— to —
乙未年 (Wood Goat)
3993 or 3786
|- Vikram Samvat||1351–1352|
|- Shaka Samvat||1216–1217|
|- Kali Yuga||4395–4396|
|Japanese calendar||Einin 3|
|Minguo calendar||617 before ROC|
|Thai solar calendar||1837–1838|
1421 or 1040 or 268
— to —
1422 or 1041 or 269
By place edit
- April 25 – King Sancho IV (the Brave) dies of a fatal illness (possibly tuberculosis), after a 11-year reign at Toledo. He is succeeded by his 9-year-old son Ferdinand IV (the Summoned) as ruler of Castile and León. In the Cortes at Valladolid, Henry of Castile (the Senator) is appointed guardian of Ferdinand, while Queen María de Molina becomes his regent. During the summer, Ferdinand is betrothed to the 5-year-old Princess Constance of Portugal. Hostilities between Castile and King Denis I (the Poet King) are ended by a peace agreement.
- June 20 – Treaty of Anagni: Pope Boniface VIII arranges a peace treaty between King Philip IV (the Fair), Charles II (the Lame), and James II. James returns Sicily to the Papal States, seeking to bring peace between the House of Anjou and the Kingdom of Sicily; the effort is in vain. Boniface is determined to put an end to the War of the Sicilian Vespers, because he wants to declare a new Crusade for the reconquest of the Holy Land.
- June 26 – Przemysł II is crowned king of Poland at Gniezno, the first coronation of a Polish ruler in 219 years. Przemysł travels to Pomerelia where he confirms the privileges of the monasteries in Oliwa and Żarnowiec. He also visits other major cities: Gdańsk, Tczew and Świecie. In August, Przemysł returns to Greater Poland but in October he travels again to Gdańsk.
- July 22 – War of Curzola: Genoese raids on the Venetian quarter in Constantinople leads to a formal declaration of war with the Republic of Venice. A Venetian fleet (some 40 war galleys) attacks Galata, the quarter of the Genoese merchants. Emperor Andronikos II (Palaiologos) arrests surviving Venetians in the capital and joins the war with the Republic of Genoa.
- Marco Polo returns to Venice after 24 years of travel in China. When the Polo's arrive, Venice is engaged in a naval war with the rival city of Genoa. Marco joins the war and arms a galley equipped with a trebuchet.
- October 23 – The first treaty forming the Auld Alliance ("Old Alliance"), between Scotland and France against England, is signed in Paris. The treaty is signed by King John Balliol and Philip IV (the Fair).
- March 5 – Battle of Maes Moydog: English forces led by William de Beauchamp defeat the Welsh rebels (some 700 men), near the modern-day town of Llanfair Caereinion, in Wales. In a night attack on the Welsh infantry, William uses cavalry to drive them into compact formations, which are then shot up by his archers. Madog ap Llywelyn, proclaimed "Prince of Wales", and the remnants of his army are routed and retreat across the Banwy River, in which many drown.
- November 13 – King Edward I (Longshanks) summons the Model Parliament to Westminster, the composition of which serves as a model for later parliaments. The parliament agrees that a tax can be raised to allow him to launch campaigns against France and the rebellious Scots for the forthcoming year.
- Construction begins on Beaumaris Castle in Anglesey under the direction of James of St. George. It is built as part of the conquest of Wales by Edward I.
- October 4 – Mongol leader Baydu Khan is executed after a 7-month reign at Tabriz. He is succeeded by Ghazan Khan, who becomes ruler of the Ilkhanate. He converts to Islam, ending a line of Tantric Buddhist leaders.
- King Jayavarman VIII is overthrown after a 52-year reign. He is succeeded by his son-in-law Indravarman III as ruler of the Khmer Empire (modern Cambodia).
- March 21 – Henry Suso, German priest, mystic and writer (d. 1366)
- September 16 – Elizabeth de Clare, English noblewoman (d. 1360)
- Catherine of Austria, German noblewoman and princess (d. 1323)
- Egill Eyjólfsson, Icelandic deacon, scholar and bishop (d. 1341)
- Giovanni Colonna, Italian cardinal (House of Colonna) (d. 1348)
- Hōjō Moritoki, Japanese nobleman and regent (shikken) (d. 1333)
- Joanna of Flanders, Flemish noblewoman and regent (d. 1374)
- John III, French nobleman and knight (House of Dreux) (d. 1331)
- John of Montfort, French nobleman (House of Montfort) (d. 1345)
- Juan Alfonso de la Cerda, French nobleman and knight (d. 1347)
- Margaret of Valois, French noblewoman and princess (d. 1342)
- Nicephorus Gregoras, Byzantine historian and writer (d. 1360)
- Nijō Tameakira, Japanese nobleman and waka poet (d. 1364)
- Odo IV (or Eudes IV), French nobleman and knight (d. 1349)
- Reginald II (the Black), Dutch nobleman and regent (d. 1343)
- Reynold Cobham, English nobleman and diplomat (d. 1361)
- Robert de Eglesfield, English nobleman and chaplain (d. 1349)
- Takatsukasa Fuyunori, Japanese nobleman and regent (d. 1337)
- Vitalis of Assisi, Italian Benedictine monk and hermit (d. 1370)
- January 2 – Agnes of Baden, German noblewoman (b. 1250)
- January 11 – Bayan of the Baarin, Mongol general (b. 1236)
- March 21 – Gaykhatu, Mongol ruler of the Ilkhanate (b. 1259)
- March 31 – Robert V de Brus, Scottish nobleman (b. 1215)
- April 10 – Baldwin of Avesnes, French nobleman (b. 1219)
- April 25 – Sancho IV (the Brave), king of Castile (b. 1258)
- May 28 – Barnim II, Polish nobleman and co-ruler (b. 1277)
- August 1 – Pietro Peregrosso, Italian scholar and cardinal
- August 8 – Ottone Visconti, Italian canon and archbishop
- August 12 – Charles Martel, titular king of Hungary (b. 1271)
- September 15 – Ruggieri degli Ubaldini, Italian archbishop
- October 4 – Baydu, Mongol ruler of the Ilkhanate (b. 1255)
- November 10 – Nicholas Segrave, English nobleman (b. 1238)
- December 7 – Gilbert de Clare, English nobleman (b. 1243)
- December 16 – Roger de Meyland, English sheriff and bishop
- December 20 – Margaret of Provence, queen of France (b. 1221)
- Anna of Greater Poland, Polish princess and abbess (b. 1253)
- Beatrice of Navarre, French noblewoman and regent (b. 1242)
- Fenenna of Kuyavia (or Kujawska), queen of Hungary (b. 1276)
- Nicholas of Gorran, French preacher and theologian (b. 1232)
- Padishah Khatun, Mongol female ruler and writer (b. 1256)
- O'Callaghan, Joseph F. (2011). The Gibraltar Crusade: Castile and the Battle for the Strait, p. 111. ISBN 978-0-8122-2302-6.
- Williams, Hywel (2005). Cassell's Chronology of World History, p. 151. London: Weidenfeld & Nicolson. ISBN 0-304-35730-8.
- Housley, Norman (1982). The Italian Crusades: The Papal-Angevin Alliance and the Crusades against Christian Lay Powers, 1254–1343, p. 93. Clarendon Press. ISBN 0-19-821925-3.
- Brzezinski, Richard (1998). History of Poland – Poland Divided, p. 23. ISBN 83-7212-019-6.
- Madden, Thomas (2012). Venice: A New History, p. 181. Penguin Group. ISBN 9780147509802.
- Nicol, Donald M (1992). Byzantium and Venice: a study in diplomatic and cultural relations, p. 219. Cambridge, UK: Cambridge University Press. ISBN 978-0-521-42894-1.
- Armstrong, Pete (2003). Osprey: Stirling Bridge & Falkirk 1297–98, p. 15. ISBN 1-84176-510-4.
- Jones, Craig Owen (2008). Compact History of Welsh Heroes: The Revolt of Madog ap Llywelyn, p. 166. Publisher: Llygad Gwalch Cyf. ISBN 9781845240752.
- Williams, Hywel (2005). Cassell's Chronology of World History. London: Weidenfeld & Nicolson. pp. 150–152. ISBN 0-304-35730-8.
- Pounds, N. J. G. (1994). The Medieval Castle in England and Wales: A Social and Political History, p. 147. Cambridge, UK: Cambridge University Press. ISBN 978-0-521-45099-7.