Du Ruhui, born in 585 in Chang'an, Shaanxi, was six years younger than Fang Xuanling. His grandfather, Du Guo, was the Minister of Works in the Sui Dynasty, and his father, Du Zha, was the Changzhou Prefectural Historian. Therefore, he was a typical official descendant who loved reading since childhood and had the characteristics of being erudite and talented. Gao Xiaoji, the Deputy Minister of the Rites Bureau, valued his talent. After growing up, he was appointed as the Fuyang Commander, but soon left the officialdom.

In 617 AD, Li Yuan rose up in Taiyuan and soon captured Chang'an. Fang Xuanling recommended Du Ruhui to serve as a military advisor in the Qin Wang Mansion, and he was soon promoted to the position of the Prefectural Chief Historian of Shaanxi Prefecture.

At that time, the Crown Prince Li Jiancheng was worried that the officials of the Qin Wang Mansion would threaten his status, so he suggested to Li Yuan that they be transferred to other places. Fang Xuanling said to Li Shimin, "Although it doesn't matter for the others to be transferred, Du Ruhui cannot be moved. He is a talented advisor who can help you complete your great cause." Upon hearing this, Li Shimin immediately petitioned to Li Yuan, requesting that Du Ruhui continue to serve in the Qin Wang Mansion.

In 618 AD, Li Yuan established the Tang Dynasty. Du Ruhui assisted Li Shimin in his military campaigns, capturing and killing Xue Rengao, defeating Liu Wuzhou, subduing Dou Jiande, and wiping out Wang Shichong, gradually unifying the country. During this process, Du Ruhui played an important role in assisting Li Shimin in analyzing military situations, advising on military affairs, and planning military strategies.

　　Disclaimer: The above content is sourced from the internet and the copyright belongs to the original author. If there is any infringement of your original copyright, please inform us and we will delete the relevant content as soon as possible.