In the process of Tang Taizong Li Shimin's struggle for the throne and the governance of the Tang Dynasty, the role played by such a strategist can be described as pivotal, and he was Li Shimin's senior strategist Du Ruyi.
Du Ruqian, Zi Keming, Han Chinese, Jingzhao Duling people. After the Sui Dynasty replaced Northern Zhou, his grandfather Du Guo was appointed as the Shangshu of the Ministry of Works and the Duke of Yixing in Sui, and his father Du Du was the governor of Changzhou in the Sui Dynasty. Coming from such a family of door valves, Du Ruyi is naturally very intelligent, and when he was young, Du Ruyi liked to talk to people about history and literature. Therefore, when he was weak, he was recruited as a reserve official by the imperial court, but unfortunately, after the peasant revolt at the end of the Sui Dynasty and the great chaos in the world, Du Ruyi abandoned the official and returned to wait for the opportunity.
In 617, Li Yuan's father and son raised an army in Taiyuan, and at the strong suggestion of Li Shimin, Li Yuan marched into Chang'an. After Chang'an was pacified, Du Ruyi was summoned by Li Shimin to serve as Cao's army in the Qin Dynasty, and was later promoted to governor of Shaanzhou. Since then, the two of them began to intersect.
With the victory of the Tang army on the battlefield, the internal struggle between the princeling party and the Qin party became more and more intense. The princelings could not tolerate the expansion of the Qin King's party, so they tried every means to suppress the Qin king's forces, and constantly excluded Li Shimin's advisers from the Qin king's palace. As the right and left arm of Li Shimin, the King of Qin, Du Ruyi and Fang Xuanling naturally became the thorns in the eyes of the princelings. Under the rumors of the crown prince Li Jiancheng and li Yuanji the Prince of Yan, Li Yuan ordered that Du Ruyi be transferred out of the Qin palace and sent to Shaanzhou to do the long history.
At this time, Li Shimin and Du Ruyi had not yet established a deep alliance, Li Shimin accepted his father's orders, and Du Ruyi did not have the heart to give up. At a time when the fate of the two monarchs and subjects seemed to be broken, Fang Xuanling, a strategist who was also under Li Shimin's command, entered the Qin Palace overnight to have a free conversation with Li Shimin.
Fang Xuanling, who was well aware of Du Ruyi's talent, warned Li Shimin: Although it is a pity that so many strategists who have been transferred this time are insignificant, only Du Ruyi, if he does not retain them, will regret it for life. Because Du Ruyi has the ability to assist the emperor, if the King of Qin does not want to be only a king of the clan under the fence in your life, then do not let Du Ruyi be transferred out of the Qin King's Palace.
After Li Shimin, who was familiar with Fang Xuanling's ability to understand people, immediately woke up and quickly wrote to Li Yuan to ask for Du Ruyi to stay, and finally Li Yuan played it accurately. After this incident, Li Shimin and Du Ruhan really established an alliance relationship. After being reused by Li Shimin, Du Ruyi began to actively devote himself to the affairs presided over by Li Shimin.
When Wu De was four years old, Li Shimin, who was then the general of Tiance, set up a literary museum to select talents in order to plan for the future. Du Ruyi responded positively to Li Shimin, was elected to the Literary Museum as an alternate official, and became the head of the eighteen bachelors, Li Shimin was comforted, and also ordered someone to write an article praising Du Ruyi, in which he praised Du Ruyi as a gentle and elegant person, humble and courteous, noble in character, and broad-minded, etc., which was spread as a beautiful talk for a while.
By the time the Tang Dynasty regime had stabilized, the struggle between the princelings and the Qin royal party had reached a fever pitch. The princelings first slandered Li Yuanjin and transferred Fang and Du out of the Qin palace. Then he designed to frame Li Shimin many times, and Li Shimin, who was still thinking of brotherhood, finally made up his mind and secretly took back Fang and Du. Under the planning of the two, in the end, on June 4, 2009, the Xuanwumen Rebellion was successful, and Li Shimin, who killed his brothers Li Jiancheng and Li Yuanji, successfully ascended to the throne.
After succeeding to the throne, Li Shimin quickly promoted Du Ruyi to Zuo Shuzi and entrusted him with important duties, and Du Ruyi's status in the imperial court continued to increase, often holding multiple positions, so that he attracted the jealousy of his colleagues. There was such a supervisor named Chen Shihe, who played the chapter "On the Theory of The Soldiers" by the emperor of the imperial history, and proposed: A person has limited energy and should not hold multiple positions. Originally, there was some truth in this statement, but Li Shimin was very displeased, in his opinion, this was to provoke the relationship between them and the monarch, and in a fit of anger, he combined Chen Shi into the army.
In fact, Du Ruyi also lived up to the emperor's grace. Du Ruhan, who held many duties, studied the canonical system of the dynasties together with Fang Xuanling, and finally formulated the prototype of the Tang Dynasty system, pushing the construction of the feudal social canon system to the peak. This feudal social canon system not only had a profound impact on later generations, but also had a certain impact on Japan, which was bent on studying the Tang Dynasty at that time.
It was precisely because of Du Ruyi's contribution that when Du Ruyi died in the fourth year of Zhenguan, Li Shimin was also heartbroken and could not handle the government for three days. In order to commend and make up for Du Ruyi, Li Shimin repeatedly sent officials to Du Ruyi's home to comfort Du Ruyi's wife and children, and named one of Du Ruyi's sons as a county duke.