Whose calligraphy work is Jiuchenggong?

A: Jiucheng Palace is a calligraphy work of Ou Yangxun in Tang Dynasty.

Ou Yangxun (about 557-64 1) was born in Linxiang, Tanzhou. Tang dynasty minister and calligrapher. Son of Ouyang Yao. When Yang Di was in Sui Dynasty, Ou Yangxun became a doctor too often. In the third year of Wushu, he took refuge in Dou Jiande, the king of Xia, and conferred the title of TaiChangQing. Wude five years, Li Yuan as a teacher, moved Guanglu as a doctor, taught him, led the prince, and got a bachelor's degree. He was made a male in Bohai County and presided over the compilation of the Collection of Arts and Literature. Zhenguan died at the age of eighty-five.

? Ou Yangxun is proficient in calligraphy, and he is also called "the four outstanding figures in the early Tang Dynasty" with Yu Shinan, Chu Suiliang and Xue Qi. Together with its son, it is called big and small Europe. His calligraphy attainments are extremely high, which created the European style and was called "the first regular script in the Tang Dynasty".