The ancients' nicknames for calligraphers

This should be the most important thing, such as Wang Xizhi, a book sage, and some people like the Tang Dynasty, such as Zhang Xu and Yan Zhenqing who wrote cursive scripts. These people are actually famous calligraphers and should all have their own names. The most important thing is to call them according to some characteristics of their calligraphy or some fields they are good at.