Kaidu (; Middle Mongol: ᠬᠠᠢ᠌ᠳᠤ [ˈqʰaɪd̥ʊ], Modern Mongol: Хайду, Khaidu [ˈχæːtʊ̽]; c. 1235 – 1301) was a grandson of Ögedei Khan (1186–1241) and thus leader of the House of Ögedei and the de facto khan of the Chagatai Khanate, a division of the Mongol Empire. He ruled parts of modern-day Xinjiang and Central Asia during the 13th century, and actively opposed his cousin, Kublai, who established the Yuan dynasty. Medieval chroniclers often mistranslated Kadan as Kaidu, mistakenly placing Kaidu at the Battle of Legnica. Kadan was the brother of Güyük, and Kaidu's uncle. Source: Wikipedia (en)