Who does Li Shimin think is the most important calligrapher of regular script?

The calligrapher who was established by Li Shimin as the supreme ruler of regular script was Ou Yangxun.

Ou Yangxun (557-64 1), a native of Linxiang, Tanzhou (now Changsha, Hunan) in the Tang Dynasty, was a famous calligrapher and official in the Tang Dynasty, and one of the four masters of regular script. In the second year of Taiping (AD 557), he was born in Hengzhou (now Hengyang, Hunan) and his ancestral home was Linxiang, Tanzhou (now Changsha, Hunan).

Ou Yangxun, together with his contemporaries Yu Shinan, Chu Suiliang and Xue Qi, were called the four masters in the early Tang Dynasty. Because his son Ouyang Tong is also good at calligraphy, he is also called "Big Europe".

He and Yu Shinan were both famous for their calligraphy in the early Tang Dynasty, also known as "Ou Yu". Later generations see danger in Chinese books, which is the most convenient for beginners and named "European style".

Representative regular script includes Jiuchenggong Li Quanming, Huangfu Birthday Monument, Huadu Temple Monument, and running script includes Zhong Nimeng's stippling and running script with thousands of characters.

He has his own unique views on calligraphy, including eight methods of calligraphy works, teaching strategies, pen theory and thirty-six methods. The inscriptions on the stupa of Huadu Temple written by Buddhist monks, the tablet of Yu Gong Gong Wen Yanbo, and the tablet of Huangfushengchen? Known as "the first regular script in Tang Dynasty".