The Yuan Dynasty marked the rule of China by the Mongol Empire beginning in 1279, after the Song Dynasty was conquered. The Mongols were originally nomadic tribes from northern China led by the powerful khan Genghis Khan in the early 13th century. Genghis Khan and his armies went on to create the largest contiguous empire in world history through their highly disciplined forces and conquests across Asia and Eastern Europe. Following Genghis Khan's death, his sons and grandsons continued expanding the Mongol Empire, with his grandson Kublai Khan eventually proclaiming the Yuan Dynasty in China in 1279, establishing Mongol control over much of China.