Who wrote the best regular script in history?

Zhao Mengfu writes regular script best.

Zhao Mengfu (f incarnation) (125410120 July-1322 July 30), born in Song Xue Road, Han nationality, also known as Taoist Jing Gong and Goulpeau, worked in Mengfu in middle age. Xing Wu, Zhejiang (now Huzhou, Zhejiang) people. A famous calligrapher, painter and poet at the end of Southern Song Dynasty and the beginning of Yuan Dynasty, his grandson, a descendant of Qin Wang Zhao.

In the 23rd year of Zhiyuan (1286), Zhao Mengfu was recommended by Cheng Jufu, an imperial envoy of Taiwan Province, to meet Kublai Khan of Yuan Shizu. Kublai Khan admired his talent and respected him very much. He has served as a bachelor in Jixian County, general manager of Jinan Road, a Confucian scholar in Jiangsu and Zhejiang, and a bachelor in Hanlin. Cheng Zhi, Bachelor of Hanlin, Doctor Rong Lu. In his later years, he gradually retired and then asked for help from his illness. He died in the second year of Zhi Zhi (1322). At the age of 69, he was "Wenmin" in posthumous title, a political official in Pingzhang, Zhongshu and Jiangsu and Zhejiang provinces. He is the author of Song Xuezhai's Anthology and so on.

Zhao Mengfu is well-read, good at poetry and prose, familiar with economy, industrial calligraphy, fine painting, good at epigraphy, fluent in temperament and appreciation. In particular, calligraphy and painting achieved the highest achievement, which created a new situation of painting style in Yuan Dynasty, and was called "the crown of Yuan people". Good at seal cutting, official script, authentic works, calligraphy and cursive script, especially regular script and calligraphy. With elegant style, neat structure and skillful brushwork, he created Zhaoti, which is also called "four masters of regular script" with Ou Yangxun, Yan Zhenqing and Liu Gongquan.