Who invented China's European style, Swallow style and Liu style?

Calligraphy is the most distinctive art form of the Chinese nation and an important part of China culture. Over the past 4,000 years, countless outstanding calligraphers and precious calligraphy works have been produced. These calligraphers formed different styles in their works, which were respected and inherited by later generations and had a very important influence on China's calligraphy art. In the classification of large fonts, there are mainly regular script, running script and cursive script. Because regular script characters are easy to identify and universal, they appear more in use. Regular script was initiated by Zhong You, developed by Erwang and innovated by Wei Bei. In the Tang Dynasty, the regular script with completely different styles in Wei and Jin Dynasties was unified. This unified work was completed by Ou Yangxun (557-64 1), Yu Shinan (558-638), Chu Suiliang (596-658) and Xue Ji (649-7 13), who were called the four great masters in the early Tang Dynasty. The real regular script didn't mature until the Tang Dynasty. The main regular script styles are: European style, Yan style, Liu Ti style and Weibei style. Yan Zhenqing (709-785) pioneered Yan Ti characters. Yan Jie hid his head and protected his tail with a pen. His lines are full, his structure is dignified and magnificent, and his composition is simple and rich, which pushes the beauty of regular script to the extreme. Its overall style is rigorous and generous, vigorous and powerful, tall and straight. Liu Gongquan (778-865) formed another style of regular script. Like Yan Zhenqing, commonly known as "Yan Liu Jingu", it can be seen that Liu Gongquan won by strength. Liu Gongquan's regular script is neat and standardized, which is deeply loved by emperors and has great influence on society. Now men's body structure is basically born out of Liu's body. Wei Bei was popular in the northern areas of Wei, Jin, Southern and Northern Dynasties. The calligraphy works preserved in this period are mainly on a large number of stone tablets, most of which are in the Northern Wei Dynasty, so this calligraphy style is called "Wei stele style". Wei Bei is often used, and the horizontal shoulders are round inside and outside, giving people a rough and unrestrained feeling.