Li Yuan's invasion of Chang'an is a very important event in Chinese history, which marked the establishment of the Tang Dynasty. So, when did Li Yuan invade Chang'an? Let's take a look.

First, let's understand the historical background of the Tang Dynasty. The Tang Dynasty is a very glorious dynasty in Chinese history. Its establishment began during the era of Emperor Taizong Li Shimin, and the heyday of the Tang Dynasty was during the reign of Emperor Xuanzong and Emperor Suzong. During this period, the Tang Dynasty made great achievements in politics, economy, culture and other aspects, becoming a peak period in Chinese history.

However, the prosperity of the Tang Dynasty also faced some problems. In the late Tang Dynasty, political corruption, people's livelihood difficulties, natural disasters and other problems emerged one after another, which gradually intensified social instability. At the same time, foreign invasions also posed a great threat to the Tang Dynasty. Under these circumstances, the rule of the Tang Dynasty was already in danger.

To solve these problems, Li Yuan, the grandson of Emperor Taizong, began his road of rebellion. He successively captured some important cities, such as Luoyang, Taiyuan, etc., and then moved towards Chang'an. In August 617 AD, Li Yuan led his army to capture Chang'an City, forcing Emperor Li Xian of the Tang Dynasty to surrender. Subsequently, Li Yuan proclaimed himself emperor and established the second dynasty of the Tang Dynasty - the Sui-Tang Dynasty.

In summary, the time when Li Yuan invaded Chang'an was August 617 AD. This event marked the establishment of the Tang Dynasty and also opened a new path for the development of Chinese history. We should learn lessons from history, strengthen political system reform, improve people's livelihood, promote economic development, maintain social stability and other aspects of work, in order to avoid similar tragedies from happening again.

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