Which monk had good calligraphy in ancient times?

Zhi Yong (Chen, Sui)' s masterpiece: A thousand words, classic.

Huai Su's (Tang's) representative works: Thousand-character essays, autobiographical posts and Notre Dame posts are the pinnacle of China's calligraphy. As the old saying goes, Huai Su's cursive achievements are unsurpassed.

Huairen (Tang) masterpiece: Collection of Wang Sheng's teachings, Classics and Preface.