How to divide the middle and late Tang Dynasties into the prosperous Tang Dynasty?

Literary works come from life, and the Tang Dynasty time period can be used as a reference based on the style of Tang poetry. Tang poetry is generally divided into four periods: early, prosperous, middle and late. \x0d\(1) Early Tang Dynasty (618-713)\x0d\The first fifty years were the continuation of the formalism\x0d\literature\x0d\ of ??the Southern Dynasty. In the last fifty years, the Four Great Masters broke through the theme of palace style poetry and deepened the The Song Dynasty established the form of rhymed poetry. Chen Ziang advocated the Jian'an style and denounced the Qi and Liang poetry styles, which opened up a path for the healthy development of Tang poetry. \x0d\ (2) The prosperity of Tang Dynasty (713-766) \x0d\ At the peak of the prosperity of poetry, great poets emerged with various styles and a wide range of themes. Positive romanticism with Li Bai as the great representative was the mainstream of poetry in the prosperous Tang Dynasty. Political poetry and frontier fortress poetry embody the style of the Tang Dynasty. Du Fu, with the great spirit of the poetry of the prosperous Tang Dynasty, comprehensively and profoundly reflected the reality after the war, paving the way for the development of realist poetry in the mid-Tang Dynasty. \x0d\ (3) Mid-Tang Dynasty (766-836) \x0d\ The largest number of poems and genres, the severe and cold reality turned the mainstream of poetry to realism, and the New Yuefu Movement represented by Bai Juyi ran throughout the entire Mid-Tang Dynasty. \x0d\ (4) Late Tang Dynasty (836-907) \x0d\ Realistic poetry continued to develop. Pi Rixiu and others inherited the tradition of the New Yuefu Movement, but they lacked creativity in art. The poems of Li Shangyin and others were full of lateness and dusk. The dreamy mood and love theme are very fluent. Through the foundation of Wen Tingyun and Wei Zhuang, the form of poetry developed rapidly in the Five Dynasties.