Events

• April 9 - Peter of Courtenay crowned emperor of the Latin Empire of Constantinople at Rome, by Pope Honorius III
• May 20 - First Barons' War, royalist victory at Lincoln.
• August 24 - First Barons' War, Battle of Sandwich between English and French soldiers in the English Channel - mercenary Eustace the Monk working for the French side, is captured and beheaded
• September 11 - Treaty of Lambeth ends First Barons' War.
• Kingdom of Serbia founded
• Fifth Crusade begins with a failed Christian attack to Egypt
• Genghis Khan destroys Kara-Khitai
• Lembitu of Lehola attempts to unify all of Estonia by assembling an army of 6000 Estonian men from different provincial counties.

Births

• John I, Duke of Brittany (died 1286)
• Baldwin, Latin Emperor of Constantinople (died 1273)
• Henry I of Cyprus
• Eleanor of Provence, Queen of Henry III of England (died 1291)
• Hulagu Khan, Mongol ruler of Persia (died 1265)
• Boniface of Savoy, Archbishop of Canterbury (died 1270)

Deaths

• August 24 - Eustace the Monk, French mercenary and pirate
• October 14 - Isabel of Gloucester, wife of King John of England
• Hermann I, Landgrave of Thuringia
• Inge II of Norway (born 1185)
• Lembitu of Lehola, Estonian resistance leader

1217

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