1237

Events 
 Thomas II of Savoy becomes count of Flanders.
 Elbląg, Poland is founded.
 Representatives of all 4 khanates lead 150,000 Mongol, Turkish and Persian troops into Europe.
 The Mongols invade Russia.
 Gualdo Tadino, Italy, is destroyed by fire.
 The County of Artois is founded in France.
 Baldwin II becomes Latin Emperor of Constantinople.
 Conrad IV of Germany becomes King of Germany.
 The Livonian Brothers of the Sword unite with the Teutonic Knights.
 Frederick II, Holy Roman Emperor defeats Lombard League at Battle of Cortenuova
 A major fire destroys some 30,000 dwellings in the Chinese capital city of Hangzhou.

 Births 
 Bohemond VI of Antioch, ruler of the principality of Antioch

 Deaths 
 April 15 – Richard Poore, English ecclesiastic
 June 6 – John de Scotia, 9th Earl of Huntingdon
 John of Brienne, king of Jerusalem and Latin Emperor of Constantinople (born c. 1148)
 Jordanus Nemorarius, German scientist
 Pons de Capduelh, French troubadour
 September 23 – Snorri Sturluson, Icelandic historian, poet and politician (born c.1178)

 Monarchs/Presidents 
 Aragon – James I King of Aragon and count of Barcelona (reigned from 1213 to 1276)
 Castile – Ferdinand III, the Saint King of Castile and León (reigned from 1217 to 1252)
 Joan, wife of Llwelyn the Great