The four masters of regular script are the collective names of four calligraphers who are famous for regular script in the history of calligraphy, also known as the four masters of regular script. They refer to Ou Yangxun (European style), Yan Zhenqing (Yan style), Liu Gongquan (Liu style) and Zhao Mengfu (Zhao Ti) in the Yuan Dynasty, while Wang Xizhi wrote running script and cursive script, the masterpiece of which is Preface to Lanting, which is known as "the best running script in the world" and "the sage of books".