The Tang Dynasty (618-907) was an important dynasty in Chinese history. Because the king's surname was Li, he was also called Li Tang. Almost all the culture, system, and social characteristics of the Tang Dynasty were inherited from the Sui Dynasty. The Li family members of the Tang Dynasty were more closely related to the Yang family members of the Sui Dynasty. The Tang Dynasty was an extension of the Sui Dynasty to a certain extent, so the history of the past dynasties Families often combine it with the Sui Dynasty to form "Sui and Tang Dynasties". In June 618, King Li Yuan of the Tang Dynasty forced Emperor Gong of the Sui Dynasty to abdicate the throne and replaced the Sui Dynasty. The country was named Tang, and the country was honored as Datang. The capital was set up in Chang'an (today's Xi'an, Shaanxi Province), and later the accompanying capitals of Luoyang, the eastern capital, and Taiyuan, the northern capital, were established. Together with Chang'an, they were called the "Three Capitals".
The official country name of the Tang Dynasty was "Tang", and the Yuan Dynasty was the first unified dynasty in Chinese history to add the word "大" to the official country name. Please refer to the article on "Country Name" in Volume 2 of "Yongzhuang Xiaopin" written by Zhu Guozhen of the Ming Dynasty: "The addition of large characters to the country name began in the Yuan Dynasty, and our dynasty was inspired by it. ... It is said that those of the Han, Tang, and Song Dynasties were ministers and ministers. "A foreign honorific."
The country name "Tang" is the ancient name of Jin, which generally refers to the central area of ??present-day Shanxi Province. Li Hu, the grandfather of Li Yuan, the emperor of the Tang Dynasty, was one of the Eight Pillar States of the Northern Zhou Dynasty. He served with meritorious service and was posthumously named "Tang Guogong". The title was passed to Li Yuan. After the Zhou Dynasty in the Sui Dynasty, Lei Guan stayed in Jinyang (today's Taiyuan, Shanxi) to stay and raise troops. Respecting the Sui Dynasty, he must conquer every battle and go straight to Chang'an. After Emperor Gong of the Sui Dynasty Yang Youchan abdicated the throne, he took "Tang" as the country's name, established the Tang Dynasty, and made Chang'an his capital.