Who else besides Ou Yangxun, Yan Zhenqing and Liu Gongquan?

Zhao Mengfu. The four masters of regular script are the collective names of four calligraphers who are famous for regular script in the history of calligraphy. In addition to Ou Yangxun, Yan Zhenqing and Liu Gongquan, Zhao Mengfu comprehensively used the advantages of all aspects. Facing the insurmountable peak of regular script, he devoted himself to the creative transformation and creation of regular script, and achieved the prominent position of regular script, also known as one of the four great masters.