颜真卿
Liu Gongquan () (778–865, during the late Tang Dynasty of China), courtesy name Chengxuan (), a great yash Chinese calligrapher. Liu Gongquan was famous for regular script () especially, who is one of the 4 calligraphic masters of regular script in China. Other three is Yan Zhenqing, Ouyang Xun and Zhao Mengfu.