What kind of emperor was Li Longji Why did Li Longji change so much before and after

For those who are very interested in Tang Dynasty Li Longji, the History Encyclopedia editor brings detailed articles for your reference.
What kind of emperor was Li Longji? At the beginning of the Kaiyuan period, people’s lives were stable, showing a rare vitality. The population increased and the land expanded, and the country was also prosperous. This was the prosperous era of the Kaiyuan period. The most noteworthy thing is the reform of the prefectural military system. The prefectural military system implemented in the early Tang Dynasty was short-lived during the Kaiyuan period due to the displacement of farmers, resulting in a rapid decline in the combat effectiveness of the Tang army. Corruption among generals and officials became rampant, and the prefectural military system existed in name only. He prevents excessive centralization of power among courtiers. Repeatedly dismissing important officials in the court may lead to the emergence of separatist forces in the long run. Caring for talents. I am very concerned about talents and have personally comforted the ministers in the court multiple times. I often send people to visit the ministers’ homes to understand their opinions on me.
After Tang Xuanzong came to power, he changed the system of prefectural troops to a recruitment system, which allowed soldiers to concentrate on training and improve the combat effectiveness of the army, as well as plug the loophole of officers being deprived of their pay. At the same time, it actually expanded the power of military governors and laid hidden dangers for ambitious ones to rebel in the future.
Official exchange system. Emperor Xuanzong of Tang stipulated that those who did well in the position of governor could be selected and transferred to become officials in major cities, and those who did well in the six ministries could be selected and transferred to become officials in local areas. The number of people in both positions is roughly the same, which is beneficial for discovering talents in different positions and also for training officials in different positions.
Of course, there are other aspects as well, such as recruiting scholars to take exams in major cities. In addition to the fixed imperial examination system, the talents discovered by Emperor Xuanzong of Tang can be tested at any time. Overall, Emperor Xuanzong of the Tang Dynasty achieved great success in governing the country during his early years. It was also a watershed between the prosperity and decline of the Tang Dynasty, marking the beginning of the Tang Dynasty. The first twenty years of Emperor Xuanzong’s reign were the peak of the Tang Dynasty, and it gradually declined over the course of one hundred and fifty-six years. Emperor Xuanzong of Tang achieved great success and rose to fame. In the latter half of the year, he indulged in pleasure, debauchery, and shame, leaving the country in a state of confusion and extravagance.
Power is inherently capricious. In an environment without institutional constraints and strong supervision, power can be regulated solely by personal will and moral sentiments, which may last for a while but cannot be sustainable. In feudal dynasties, under the theoretical system of supreme imperial power, such demands were tantamount to seeking the skin of a tiger. Based on this point, whether it is Li Longji or Li Shimin, their trajectory of first appearing bright and then appearing dark is inevitable, not to mention their long reign and great achievements. It’s easy to see history through God’s vision, but how many people can transcend it and think from a historical perspective?
Li Longji’s contribution was to push the Tang Dynasty to its peak, which was definitely considered the world’s top power at that time. However, he managed to destroy the prosperous era of the Tang Dynasty that several generations had worked hard to establish. From then on, the Tang Dynasty’s vitality was greatly damaged, from prosperity to decline, and it never recovered until its downfall. He had an inescapable responsibility for the downfall of the Tang Dynasty. Emperor Xuanzong of Tang himself was unable to do so, so he appointed Wu Zetian to the throne. After Wu Zetian’s death, he seized power and restored the throne of Emperor Li Tang. Almost ruined a dynasty.
After Wu Zetian ascended to the throne, she basically continued the policies of the Zhenguan period and maintained the prosperous situation of the Tang Dynasty. Society also developed and politics were relatively clear. In Wu Zetian’s later years, society was relatively dark and corrupt. During the period from Wu Zetian to Emperor Zhongzong of Tang, the court was unstable and the society was turbulent. Landlords and tycoons annexed land, and a large number of farmers were displaced. The rule of the Tang Dynasty was relatively chaotic. Emperor Xuanzong of Tang, Li Longji, gained political power through two reforms. At the beginning of his reign, Emperor Xuanzong was able to listen to different opinions, quickly quelled the forces of the Taiping Princess’s rebellion, eliminated the interference of relatives in politics, stabilized the court situation, and appointed a large number of talented people.
He appointed talented individuals, continuously improved the imperial examination system, established the palace examination system, selected talents through the imperial examination system, widely utilized talents, and promoted the development of the country! Rest and recuperate, focus on the development of agriculture, and improve the water transportation stations. Later on, Emperor Xuanzong of Tang began to enjoy life and became obsessed with harem life, which led to the decline of the Tang Dynasty!
Li Longji’s life as emperor was a life of mixed merits and demerits. In the first half of his life, he created the prosperous era of Kaiyuan, which quickly revived the Tang Dynasty from the shadow of the authoritarian rule of Empress Wu and Empress Wei. In the latter half of his life, Li Longji became obsessed with alcohol and sex due to his favor towards eunuchs, leading to the downfall of the court and ultimately the An Lushan Rebellion.