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  • May 5 – Kublai Khan becomes a claimant to the Mongol Empire, after the death of Möngke Khan.[1]
  • May 21 – Kublai sends his envoy Hao Jing to negotiate with Song dynasty Chancellor Jia Sidao, after the small force left by Kublai south of the Yangtze River is destroyed, by a Chinese army of the Southern Song dynasty. Chancellor Jia Sidao imprisons the entire embassy of Kublai. This slight will not be forgotten by Kublai, but he is unable to assault the Song, due to the civil war with his rival brother Ariq Böke.[citation needed]
  • September 3 – Battle of Ain Jalut in Galilee: The Mamluks defeat the Mongols, marking their first decisive defeat, and the point of maximum expansion of the Mongol Empire. Isa ibn Muhanna is appointed amir al-ʿarab under the Mamluks.[2][3]