When Genghis Khan died  in 1227 his son took over of the Mongol Empire for about 12 years. When the son died four of the grandsons split the empire. The line of Chagadai ruled Central Asia and the great later Mongol ruler Tamerlane ruled in the 15th century. The second line was Hulegu who ruled Persia and eventually conquered India and established the Mughals who controlled India until the British kicked them out in the 19th century, Khubilia Khan ruled east Asia and completed the conquest of China in 1279. Batu Khan took over Russia and the Ukraine and eventually became the Cossacks.

(The Great Courses – From Yao to Mao: 5000 years of Chinese History)