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|Ab urbe condita||1967|
|Balinese saka calendar||1135–1136|
|English Regnal year||15 Joh. 1 – 16 Joh. 1|
|Chinese calendar||癸酉年 (Water Rooster)
3910 or 3850
— to —
甲戌年 (Wood Dog)
3911 or 3851
|- Vikram Samvat||1270–1271|
|- Shaka Samvat||1135–1136|
|- Kali Yuga||4314–4315|
|Japanese calendar||Kenpō 2
|Minguo calendar||698 before ROC
|Thai solar calendar||1756–1757|
1340 or 959 or 187
— to —
1341 or 960 or 188
Year 1214 (MCCXIV) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar, the 1214th year of the Common Era (CE) and Anno Domini (AD) designations, the 214th year of the 2nd millennium, the 14th year of the 13th century, and the 5th year of the 1210s decade.
- November 1 – Siege of Sinope: The Seljuk Turks under Sultan Kaykaus I capture the strategic Black Sea port city of Sinope – at the time held by the Empire of Trebizond (one of the Byzantine successor states formed after the Fourth Crusade). Emperor Alexios I of Trebizond leads an army to break the siege, but he is defeated and captured. His capture forced the Byzantines to accept tributary status to Kaykaus.
- February 15 – King John (Lackland) lands with an invasion force (accompanied by mercenaries) at La Rochelle; many barons of England refuse to join him in the campaign. John sends his half-brother William Longespée (Long Sword) to Flanders, with money to assemble a mercenary army there. John pushes the French forces north-east from Poitou towards Paris, while Emperor Otto IV marches south-west from Flanders.
- King Philip II (Augustus) decides to defend the French territories by leaving a third of his army under his son, Prince Louis to confront John (Lackland) in the Loire Valley – while Philip heads for Flanders to raid the region. On July 2, John's forces are confronted by a French relief force while they besiege the castle of Roche-au-Moine. John retreats back to La Rochelle, but his rearguard suffers immensely by the French army.
- June – Otto IV arrives in Flanders with a small army; four German nobles have joined him, but he is soon reinforced by troops of Renaud I, duke of Boulogne, Ferdinand, (jure uxoris) count of Flanders and the mercenaries under William Longespée. On July 26, Philip II arrives at the Flemish town of Tournai with his army (some 7,000 men), while the allied forces encamp 12 kilometers south at the Castle of Mortagne (France).
- July 27 – Battle of Bouvines: Philip II defeats an army (some 9,000 men) of German, English and Flemish soldiers led by Otto IV near Bouvines, ending the Anglo-French War. The French forces have taken a considerable number of soldiers prisoner, including 131 knights and five counts with Ferdinand, Renaud I and William Longespée among them.
- September 18 – Treaty of Chinon: John (Lackland) makes a truce with Philip II at Castle of Chinon, and recognizes the Capetian (French) territorial gains at the expense of the Angevin Empire.
- October 5 – Upon the death of their father, King Alfonso VIII (the Noble), and of their mother, Eleanor of England on October 31, Berenguela becomes regent of her 10-year-old brother, Henry I.
- November 20 – A group of English nobles, after finding a copy of the Charter of Liberties, swear an oath at the altar of Bury St. Edmunds, to force John (Lackland) to acknowledge their rights.
- December 4 – King William the Lion dies after a 49-year reign at Stirling. He is succeeded by his son, Alexander II, who is crowned as ruler of Scotland at Scone (until 1249).
- Spring – Emperor Xuan Zong of the Jurchen-led Chinese Jin Dynasty surrenders to the Mongols under Genghis khan – who have besieged the capital of Zhongdu (modern-day Beijing) for a year. He is forced to pay tribute (including some 3,000 horses, 10,000 'bolts' of silk and his daughter), along with subjugation to the Mongol Khan. Xuan Zong abandons northern China and moves his court to Kaifeng.
- After securing all Jin lands north of the Yellow River, Genghis Khan receives a message that Xuan Zong has moved his capital to Kaifeng. He returns to Zhongdu and precedes the city with the help of thousands of Chinese engineers. The Mongols starve the city out (the inhabitants are forced to eat the dead). The garrison with short of supply for ammunition of the cannons holds out for the winter.
- In his campaigns in Liaodong, the Mongol general Muqali (or Mukhali) forms a newly Khitan-Chinese army and a special corps of some 12,000 Chinese auxiliary troops.
- June 20 – A papal ordinance defines the rights of the scholars at the University of Oxford in England.
- April 25 – Louis IX (the Saint), king of France (d. 1270)
- July 29 – Sturla Þórðarson, Icelandic chieftain (d. 1284)
- Albert of Bergamo, Italian Dominican monk (d. 1279)
- Al-Qurtubi, Moorish scholar, jurist and writer (d. 1273)
- Isabella of England, Holy Roman Empress (d. 1241)
- Ottaviano degli Ubaldini, Italian cardinal (d. 1273)
- January 25 – Taira no Tokuko, Japanese empress (b. 1155)
- February 13 – Theobald I (or Thibauld), French nobleman
- April 21 – John of Ford, English Cistercian prior and abbot
- June 24 – Gilbert Glanvill (or Glanville), bishop of Rochester
- July 27 – Stephen Longchamp, Norman nobleman and knight
- August 18 – Pedro Fernández de Castro, Spanish nobleman
- August 30 – Peter of Capua, Italian cardinal and papal legate
- September 14 – Albert of Vercelli, Latin patriarch of Jerusalem
- September 16 – Diego López II, Spanish nobleman (b. 1152)
- October 5 – Alfonso VIII (the Noble), king of Castile (b. 1155)
- October 18 – John de Gray (or de Grey), bishop of Norwich
- October 31 – Eleanor of England, queen of Castile (b. 1161)
- December 4 – William the Lion, king of Scotland (b. 1142)
- December 8 – Sasaki Takatsuna, Japanese samurai (b. 1160)
- Ala al-Din Atsiz, ruler of the Ghurid Sultanate (b. 1159)
- Aubrey de Vere, English nobleman and knight (b. 1163)
- Filocalo Navigajoso, Latin ruler (megadux) of Lemnos
- Henry VI (the Younger), German nobleman (b. 1196)
- Neophytos of Cyprus, Cypriot priest and hermit (b. 1134)
- Robert fitzRoger, English Sheriff of Norfolk and Suffolk
- William I of Cagliari, ruler (judge) of Sardinia (b. 1160)
- Treadgold, Warren (1997). A History of the Byzantine State and Society, p. 718. Stanford, California: Stanford University Press. ISBN 0-804-72630-2.
- Palmer, Alan; Veronica (1992). The Chronology of British History. London: Century Ltd. pp. 77–79. ISBN 0-7126-5616-2.
- Oman, Charles (2012). A History of the Art of War: The Middle Ages from the Fourth to the Fourteenth Century, p. 539. ISBN 978-1-62358-003-2.
- Linehan, Peter (1999). "Chapter 21: Castile, Portugal and Navarre". In David Abulafia (ed.). The New Cambridge Medieval History c.1198-c.1300. Cambridge: Cambridge University Press. pp. 668–671. ISBN 0-521-36289-X.
- Man, John (2011). Genghis Khan: Life, Death and Resurrection, pp. 169–170. ISBN 978-0-553-81498-9.
- Man, John (2011). Genghis Khan: Life, Death and Resurrection, p. 171. ISBN 978-0-553-81498-9.
- Consoli, Joseph P. (2013). The Novellino or One Hundred Ancient Tales: An Edition and Translation based on the 1525 Gualteruzzi editio princeps. Routledge. p. 158. ISBN 978-1-136-51105-9.
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