The title of Qin Dynasty comes from place names. According to historical records, the ancestors of the Qin Dynasty were sages Hao Tao and Boyi. They were originally descendants of Shao Hao, an ancient tribal leader, and their surname was Wang. At that time, Zhao Fuzheng was the king of Zhou, and he was sealed in Zhao Cheng. During the ruling period, dogs invaded Haojing, which was officially made a vassal state because of its meritorious service in defending the Zhou royal family, and Qin became the national title. Before Qin Shihuang unified China, Qin was only a vassal state. After reunification, the name of a vassal state changed to that of a dynasty in China.