Ibn Khaldun vs Yang Guozhong

Ibn Khaldun served as vizier to the Marinid ruler Abu Inan in Tlemcen. He was involved in court intrigues and political maneuvering, which led to his imprisonment for two years after falling out of favor. This experience shaped his understanding of political power and decline.

Ibn Khaldun completed the 'Muqaddimah' (Prolegomena), the introduction to his universal history. This work laid the foundations for historiography, sociology, and economics, introducing concepts like social cohesion (asabiyya), the cyclical theory of civilizations, and the impact of environment on society.

Ibn Khaldun wrote 'Kitab al-Ibar' (Book of Lessons), a universal history covering the Arabs, Berbers, and other civilizations. The work applied his sociological theories from the Muqaddimah to historical analysis, making it a pioneering work in comparative history.

Ibn Khaldun was appointed Grand Qadi (chief judge) of the Maliki school in Mamluk Cairo. He held this position multiple times, facing political pressures and conflicts with other judges. His tenure was marked by efforts to reform the judiciary and uphold strict legal standards.

During the siege of Damascus by Timur, Ibn Khaldun negotiated with the Mongol conqueror outside the city walls. He recorded their conversations in his autobiography, providing a unique firsthand account of Timur's character and ambitions, and secured safe passage for himself.

Yang Guozhong was appointed Chancellor under Emperor Xuanzong, replacing the deceased Li Linfu. He was the cousin of Yang Guifei, the emperor's favorite consort, and his rise was due to family connections rather than merit.

Yang Guozhong repeatedly antagonized An Lushan, accusing him of plotting rebellion and raiding his mansion in Chang'an. These actions, combined with An's fear of being purged, accelerated the outbreak of the An Lushan Rebellion in 755.

Yang Guozhong forced the Tang general Geshu Han to engage An Lushan's forces at Tong Pass, despite Geshu's advice to hold the defensive position. The Tang army was defeated, and the pass fell, opening the way to Chang'an.

As Emperor Xuanzong fled Chang'an after the fall of Tong Pass, mutinous soldiers at Mawei Station blamed Yang Guozhong for the disaster. They killed him and forced the emperor to order the death of Yang Guifei.