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1186 CE: Birth of Mongol emperor Ogedei Khan.
1206 CE - 1368 CE: The Mongol Empire rules in Central and East Asia.
1219 CE - 1225 CE: Ogedei assists his father Genghis Khan on several military campaigns, notably against the Khwarazm empire.
1228 CE - 1240 CE: Composition of the Secret History of the Mongols.
1229 CE - 1241 CE: Reign of Ogedei Khan as the ruler of the Mongol Empire.
1230 CE - 1231 CE: The Mongols attack the Jurchen Jin State.
1231 CE - 1232 CE: Ogedei Khan leads a Mongol invasion into Korea.
1233 CE: Kaifeng, capital of the Jurchen Jin State, falls after a lengthy siege by the Mongols.
1234 CE - 1236 CE: Ogedei Khan orders a census to be conducted for tax purposes across northern China.
1234 CE: The Mongols attack and conquer the Jurchen Jin State in northern China.
1235 CE: Ogedei Khan orders the construction of a new capital of the Mongol Empire at Karakorum, Mongolia.
1235 CE: The Mongols invade northern Iraq and western Asia
1236 CE - 1242 CE: Multiple Mongol armies attack western Asia, Russia, Poland, and Hungary.
1237 CE: The city of Ryazan (Riazan) is besieged and captured by the Mongols.
1238 CE: The Mongols invade Azerbaijan, Georgia, and Armenia.
1238 CE: The Mongols capture the city of Vladimir.
1238 CE: The Mongols capture the city of Torshok.
1240 CE: The Mongols capture Kiev.
1241 CE: The Mongols defeat an army led by Henry the Pious, the Duke of Silesia, near Liegnitz (Legnica).
1241 CE: The Mongols defeat an army led by Bela IV, king of Hungary, at the Battle of Mohi.
1241 CE: The Mongols capture Buda and Pest.
1241 CE: The Mongols capture the great city of Gran (Esztergom) in Hungary.
1241 CE: Ogedei Khan, ruler of the Mongol Empire, dies at the capital Karakorum.