As an outstanding emperor of the Tang Dynasty, Emperor Xuanzong Li Longji achieved remarkable political achievements during his reign, especially in the first half of his life, when he co-founded the "Kaiyuan Prosperity" with Empress Wu Zetian. However, the later years of Li Longji's life were extremely tragic, with political unrest in the country and immense suffering for himself. Even more tragically, he was unknowingly replaced by his own son and became a powerless retired emperor.

Firstly, the political situation in Li Longji's later years was tumultuous. In the later stage of his reign, due to the impact of the An-Shi Rebellion, the country's politics gradually declined. Li Longji himself gradually lost control over the court affairs, leading to increasing corruption and the rise of eunuch power. Under these circumstances, Li Longji's status was gradually weakened, and he was unable to effectively handle national affairs.

Secondly, Li Longji's physical health deteriorated in his later years. Due to constant hard work and political pressure, Li Longji's body gradually weakened, and he could no longer govern the country with the same energy as in his youth. This made him even more helpless in handling government affairs and unable to cope with the escalating political crisis.

Most tragically, Li Longji was unknowingly replaced by his own son. At that time, Crown Prince Li Heng (later Emperor Suzong) took advantage of Li Longji's illness to stage a coup and seize the throne. Li Longji was placed under house arrest and lost all power in this coup. Although he was nominally still the retired emperor, he was unable to interfere with court affairs in reality. This was undoubtedly a great sorrow for an emperor who had once enjoyed great glory.

Looking back on Li Longji's life, we can see a process from glory to decline. In his younger days, he co-founded the "Kaiyuan Prosperity" with Empress Wu Zetian, bringing the Tang Dynasty to its peak. However, as he aged and the political environment changed, Li Longji gradually lost control over the country. In the end, he suffered an extremely tragic fate in his later years: being replaced by his son without realizing it. This historical event not only reflects the tragedy of Li Longji's personal fate but also reflects the turbulence and decline of Tang Dynasty politics at that time.

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