In the early Tang Dynasty, senior officials in the Middle Shu, subordinates in the middle shu, and senior officials in the Middle Shu discussed state affairs together, all of whom were prime ministers. The prime minister is an official who assists the emperor in managing the state affairs. "New Book of Tang · Baiguan Zhi" : "Zuo Tianzi chief baiguan, governing everything, its heavy duty". Later, because before Emperor Taizong ascended to the throne, although he had served as a minister, his s...
