The Chagatai Khanate was a Mongol and later Turkicized khanate that comprised the lands ruled by Chagatai Khan, second son of Genghis Khan, and his descendants and successors. Initially it was a part of the Mongol Empire, but it became a functionally separate khanate with the fragmentation of the Mongol Empire after 1259. The Chagatai Khanate recognized the nominal supremacy of the Yuan dynasty in 1304, but became split into two parts in the mid-14th century: the Western Chagatai Khanate and the Moghulistan Khanate.