Liu Ti refers to Liu Gongquan (778-865), the last great calligrapher in the Tang Dynasty and one of the four masters of regular script. Liu's body is balanced, thin and hard, chasing Weibei steadily, with smooth and beautiful stippling, thick bones and tight body. "Books are expensive, thin and hard, and the spirit is clear." Compared with his face, his regular script is slightly flat and thin, so it is called "Yan Gu".
Personal achievements: official to prince, so he is called "Liu" by the world. He was a 29-year-old scholar and served as a junior official in the local area. Later, Tang Muzong came across his handwriting. Once called to Chang 'an by the imperial court. Liu Gongquan was in his forties at that time.