Peng Yue
After establishing the Han dynasty, Emperor Gaozu appointed princes and vassal kings to help him govern the Han Empire and gave each of them a piece of land. There were seven vassal kings who were not related to the imperial clan: Zang Tu, the King of Yan; Hán Xin, the King of Hán; Han Xin, the King of Chu; Peng Yue, the King of Liang; Ying Bu, the King of Huainan; Zhang Er, the King of Zhao; Wu Rui, the King of Changsha. However, later, the emperor became worried that the vassal kings might rebel against him because they, after all, had no blood relations with him. Han Xin and Peng Yue were (falsely) accused of treason, arrested and executed along with their families. Ying Bu and Zang Tu rebelled against him but were defeated and killed. Only Wu Rui and Zhang Er were left.