What are the achievements of calligraphy in Tang Dynasty?

Calligraphy in the Tang Dynasty occupies an extremely important position in the whole history of calligraphy in China, reaching an unprecedented height in terms of calligraphers, calligraphy styles, styles and schools, and calligraphy theory. This is inseparable from the enlightened politics of the Tang Dynasty and the extreme admiration of Emperor Taizong. Outstanding representatives of this period, such as Yan Zhenqing, Zhang Xu, Huai Su, Liu Gongquan and others, became models for later generations with their unique artistic charm. This is indeed an era of pioneering schools and talented people.