Which generation of calligrapher is Liu Gongquan?

Liu Gongquan was a calligrapher in the Tang Dynasty. His life is a bit tortuous, and he succumbed to his calligraphy. When he was in the imperial examination, the emperor saw that his handwriting was too good, so he didn't give him more official positions. He stayed with him to copy and write for the emperor all his life, and there was little chance of promotion. However, Liu Gongquan's calligraphy was very popular at that time. If the official ancestral tablet at that time had not been written by Liu Gongquan, people would say that this family was really unfilial.