Liu Gongquan (778 -865), whose real name is Cheng Xuan, was born in Jingzhao, Tang Dynasty. He was a prince, who was called "Liu" in the world. Because he was also named Duke of Hedong by the emperor, later generations also called him "Liu Hedong". He is a descendant of Yan Zhenqing, and later called them "Yan Liu", which became a model of calligraphy in past dynasties. Together with Zhao Mengfu, Yan Zhenqing and Ou Yangxun, they are also called "Four Great Calligraphers".
Liu Gongquan, the last great calligrapher in the Tang Dynasty, was born in Yaoxian County, Shaanxi Province. He inherited the calligraphy structure of his predecessors and created the so-called "six-body", which was a model for later generations until he entered the printing age. His calligraphy incarnates thousands and spreads among the people and even abroad. His calligraphy was always valued in Tang Muzong, Jing Zong and Wenzong. He lived an official life, grew up in the Forbidden City and had a successful career. Emperor Wenzong called his words "Zhong Wang resurrected, but it is hard to see with a pen": Emperor Mu Zongdi asked him how to use a pen best, and he said, "Use a pen in your heart, and your heart is right." This famous saying was passed down by later generations as a story of "pen admonition" "Liu Ti" is as famous as "Yan Ti", also known as "Yan Liu Jin Gu".