During the turmoil at the end of Sui Dynasty, Emperor Taizong led the troops to fight and strategized from his youth until he ascended the throne at the age of 27, and he reigned for 24 years, creating a "rule of Zhenguan" and laying a "prosperous Tang Dynasty". He not only compiled the history of the previous dynasties such as Sui Shu, the Book of Northern Qi, Liang Shu and Chen Shu, but also personally wrote four historical books such as The Book of Jin, Emperor Fan and Golden Mirror. He is also famous for being good at absorbing the experience of the rise and fall of the previous dynasties, and he is eloquent, which can not but affect his poetry and leave a profound historical mark on it.
We can clearly see this from his lyrical poems and comments in some poems. Isn't the imperial consciousness of "following the text and following the trail, learning from foreigners and learning from foreigners" the expression of his sense of history from another angle? In addition, we can also have a glimpse from the microscopic point of view, which is a special time contrast technique that often appears when describing scenery in poetry.