Which emperor established the post of prime minister?

With the change of dynasties, the official titles of prime ministers appeared one after another: Prime Minister, Guo Xiang, Da Situ, Secretary of the Secretariat, Minister of the Secretariat, Minister of Politics, Cabinet University, Minister of Military Affairs and so on. According to records, as early as the Shang and Zhou Dynasties, it was known as Taizai, Yin and Taishi. Although these official positions were intended to assist the emperor in managing the country, they did not have the nature of aides in the state machine at that time. During the Spring and Autumn Period and the Warring States Period, Xiang's name appeared. For example, Guan Zhong is the phase of Qi, and Lin Xiangru is the phase of Zhao. Because of the prevailing atmosphere of cultivating scholars at that time, many knowledgeable people were recruited by various countries. Because of its thorough reform and rapid development, Qin was the first country to set up a county system in the Warring States Period, and in the second year (309 BC), it was the same prime minister as Gui Liji. The name of the prime minister began. After Qin Shihuang unified the six countries, the prime minister was first identified as an official system. During the Yin and Zhou Dynasties before the Qin Dynasty, the supreme ruler of the country ruled through enfeoffment of princes. The king of Shang dynasty or the emperor of Zhou dynasty could not interfere in the internal affairs of the enfeoffment country, and because the monarch of the enfeoffment country was hereditary by nobles, the emperor had no right to remove their ruling power in the enfeoffment country. After Qin Shihuang, the feudal system was abolished, counties were set up, governors were abolished and officials were set up. The emperor no longer ruled by patriarchal blood relations, but appointed bureaucrats to give orders to the whole country. Therefore, it is necessary to organize a bureaucracy to assist government affairs with the help of the prime minister. The Prime Minister came into being under such historical conditions. With the development of feudal countries, the prime minister system lasted for two thousand years.