达延汗
While the Golden Horde lost its power in 1480, Mongol raids on Ming borderlands became virtually constant. Under Dayan Khan they reached a new level of organization. Dayan Khan intended to maintain good relations with Ming dynasty at first. His envoys were sent to sign open-trade contract with gifts, but one of them was killed by the Ming court, so he launched military expeditions into the Ming China. Dayan Khan as a mature ruler had no interest in joining the Ming's tribute system.