Truly complete five-character poems became popular in the Han Dynasty. Yuefu poetry in Han Dynasty is an important stage in the development of five-character poetry in the history of China's poetry, which can almost be compared with The Book of Songs and Songs of the South. Yuefu poems are mostly miscellaneous poems, but there are many excellent works in Five Ancient Poems, such as Peacock Flying Southeast and Lusang. In terms of importance, the most important period of five-character poems is the Han Dynasty. Although there were many excellent five-character ancient poems in the Tang Dynasty, I think the maturity of five-character ancient poems should be attributed to the Han Dynasty.
There are also seven-character poems in the Han Dynasty, including Bai Liang style, which is not completely certain. In Wei and Jin Dynasties, Cao Bu's Ge Yanxing became a masterpiece of early seven-character poems, but five-character poems were advocated in Wei, Jin, Southern and Northern Dynasties. Bao Zhao was the first poet who wrote seven-character poems vigorously in the Tang Dynasty, which promoted the development of seven-character poems in the Tang Dynasty.
Quatrains appeared in Yuefu short stories in Han, Wei and Six Dynasties. During the Qi and Liang Dynasties, four quatrains became the standard of poetry. When we read 300 Tang poems carefully, we can see that there are two kinds of quatrains: ancient quatrains and French quatrains. Metric poems also appeared in the Qi and Liang Dynasties, and poems completely consistent with metrical poems appeared in the late Southern Dynasties.
So from this point of view, although the genre of Tang poetry is the best, a large number of mature metrical poems and quatrains (including archaic quatrains and metrical quatrains) only appeared in the Tang Dynasty. It can be said that metrical poems (including metrical quatrains, arrangement rules and five or seven rhymes) and quatrains (including archaic quatrains and metrical quatrains) are the most representative poems in the Tang Dynasty.