As early as the Chu-Han War, in order to divide Xiang Yu's camp and strengthen his own power, Liu Bang once made Han Xin, Yingbu, etc. kings. These people were called "different surnames" because they were not Liu surnames.Because the kings with different surnames were not direct descendants of Liu Bang and were dominant in one party, they were all exterminated one after another within a few years after the enfeoffment.