Cao Zhibai

Cao Zhibai (; 1271-1355) was a renowned Chinese painter and bibliophile from the Yuan Dynasty. His courtesy name was Youxuan (又玄) or Zhensu (真素), and sobriquet Yunxi (云西).
References.
Barnhart, R. M. et al. (1997). Three thousand years of Chinese painting. New Haven, Yale University Press. 