Qin Shihuang (259 BC to 210 BC) was the first founding emperor of the Qin Dynasty to complete the unification of China. Later generations called him "one emperor through the ages." His surname was Ying, and his name was Zheng. The Han nationality was born in the State of Zhao, so it is also called Zhao Zheng. He ascended the throne at the age of 13. At the age of 22, an adult coronation ceremony was held in the old capital Yongcheng. From then on, he officially ascended the throne to "manage the affairs of the state". At the age of 39, he completed the historical cause of unifying China and proclaimed himself emperor. In 246 BC, King Qin Yingzheng ascended the throne. Due to his young age, the affairs of the court were in charge of the Queen Mother, Prime Ministers Lu Buwei and Lao Ai. In 238 BC (the ninth year of Qin Wangzheng's reign), Qin Wangzheng personally took charge of the government, got rid of Lu, Lao and others, and reused Li Si and Wei Liao. From 230 BC to 221 BC, he successively destroyed Han, Zhao, Wei, Chu, and The six kingdoms of Yan and Qi completed the great cause of unifying the country and established the Qin Dynasty, the first unified, multi-ethnic, authoritarian centralized state in Chinese history. King Qin Yingzheng believed that his achievements were better than those of the Three Sovereigns and Five Emperors before him, so he named himself "Emperor". One ruler was called Qin II.