wanton violator of his sacred oath taken many times, at Aachen, Ferentino, Veroli and San Germano. Meanwhile, the Crusader army fortifies Sidon Sea Castle and rebuilds Montfort Castle, northeast of Acre, as a new headquarter castle for the Teutonic Knights, who called it Starkenburg. Swedish-Novgorodian War: Grand Prince Yaroslav II of Vladimir leads an attack from the Novgorod Republic on Baltic Finnic peoples in eastern Fennoscandia, called "Yem", whom he devastates. November 24 – Prince Leszek I (the White) is assassinated in an ambush on a council of Polish dukes in the city of Gąsawa, an event which later becomes known as the Gąsawa Massacre. Mongol Empire Autumn – Prince Tolui, Mongol regent and youngest son of Genghis Khan, assembles a Kurultai in the homelands of Mongolia. He persuades the chieftains of the clan to carry out Genghis' wishes. Ögedei Khan receives the Great Khanate. Genghis' eldest son, Jochi, dies before him, and his lands are divided between his two sons Batu Khan and Orda Khan, who rule the Western provinces (the Golden Horde and White Horde). Genghis' second son, Chagatai Khan, inherits the former Uigur and Kara-Khanid Khanate (now called the Chagatai Khanate). Tolui receives the Mongol homelands. Levant November 12 – Al-Mu'azzam Isa, Ayyubid ruler of Damascus, dies after a 11-year reign. He is succeeded by his 21-year-old son, An-Nasir Dawud, who faces opposition from his uncle, Sultan Al-Kamil of Egypt. England Spring – The 19-year-old Henry III assumes control of the government. He appoints Hubert de Burgh as Governor of Rochester Castle and rewards him with the title Earl of Kent. Asia Siege of Yinchuan: Mongol forces eliminate the Western Xia (or Xi Xia) and execute Emperor Mo (or Li Xian). Genghis Khan dies during the siege under debated circumstances, but this is kept secret from the army until the siege's end. Yinchuan is pillaged and its entire population is slaughtered or sold into slavery. Genghis orders the imperial family to be executed, effectively ending the Tangut royal lineage. August 18 – Genghis Khan dies during the fall of Yinchuan after a 21-year reign. His exact cause of death remains a mystery, and is variously attributed to being killed in action against the Western Xia, illness, falling from his horse, or wounds sustained during hunting. Genghis is succeeded by his third son, Ögedei Khan, who becomes the "Great Khan" of the Mongol Empire. By topic Cities and