Liu Gongquan (778-865), the last great calligrapher of the Tang Dynasty, was born in Yaoxian County, Shaanxi Province. He inherited the calligraphy structure of his predecessors and created his own so-called "Liu style", which served as a model for generations to come until he entered the printed era. His calligraphy has taken many incarnations and spread among the people and even abroad. His calligraphy has always been valued in the three dynasties of Tang Muzong, Jingzong and Wenzong. He lived in officialdom and served as a scribe, grew up in prison, and had a prosperous official career. Emperor Wenzong called his calligraphy "Zhong Wang is resurrected, and there is nothing more to add to it." Emperor Mu Zong asked him how to best use his pen, and he said: "Use your pen with your heart in mind, and if your heart is upright, your pen will be correct." This famous saying was passed down to later generations as "The Admonishment of the Pen". "Liu Ti" is as famous as "Yan Ti", and is also called "Yan Jin Liu Gu".

The culture of the Tang Dynasty was magnificent, and there were many famous calligraphy artists. In the early Tang Dynasty, there were Ou, Yu, Chu, and Xue; in the prosperous Tang Dynasty, there were Zhang Xu, Yan Zhenqing, and Huai Su; in the middle and late Tang Dynasty, there were Liu Gongquan and Shen Chuanshi. Liu Gongquan took over the banner of regular script from Yan Zhenqing, created his own "Liu style", and climbed to another peak. Later generations were collectively known as "Yan Liu" and became a model of calligraphy art in the past dynasties.