Why was the Wei, Jin, Southern and Northern Dynasties a glorious period in the history of ancient Chinese literary theory?

The Wei, Jin, Southern and Northern Dynasties was a brilliant period in the history of ancient Chinese literary theory mainly because of the following reasons: 1. Prosperity of literature: The Wei, Jin, Southern and Northern Dynasties was a period of literary prosperity in Chinese history. Many outstanding writers appeared, such as Cao Cao, Cao Pi, Cao Zhi, Tao Yuanming, Xie Lingyun, Liu Zongyuan, etc. The works of these writers not only made outstanding achievements in literary creation, but also had profound insights in literary theory and criticism, leaving precious wealth in the history of ancient Chinese literary theory. 2. The development of literary theory: During the Wei, Jin, and Southern and Northern Dynasties, literary theory also began to develop. The famous literary theorists such as Wang Chong, Zhang Heng, He Yan and others put forward many important literary theories such as "Nature Theory","Reaction Theory","Inaction Theory", etc., which had a profound impact on the aesthetic theory and cultural theory in the history of ancient Chinese literary theory. 3. Integration of academic thoughts: The academic thoughts of the Wei, Jin, Southern and Northern Dynasties also began to integrate. Famous academic thoughts such as "metaphysics" and "Buddhist thoughts" had a profound impact on the ideology, culture, and aesthetics of ancient Chinese literary theory. 4. Outstanding achievements in literary theory: The achievements of literary theory in the Wei, Jin, Southern and Northern Dynasties were also very remarkable. These literary critics put forward many important literary criticism views, such as "Wei-Jin demeanor","poetry and wine fantasy","demeanor lofty" and so on, which had a far-reaching impact on the aesthetics, culture, thought and other aspects of the history of ancient Chinese literary theory. To sum up, the literature, literary theory, academic thoughts, and literary theory of the Wei, Jin, and Southern and Northern Dynasties had made very brilliant achievements, leaving a brilliant period in the history of ancient Chinese literary theory.