Because he served as the prefect of Pingyuan and was given the title of Duke of Lu County, he was known as "Yan Pingyuan", also known as "Yan Lu Gong". He was upright by nature, and he lived during the turning period of the Tang Dynasty's prosperity and decline. In the late Xuanzong Dynasty, the treacherous ministers Yang Guozhong, Lu Qi and others were autocratic and good at governing. He fought against them with the independent style of a Confucian scholar. After the Anshi Rebellion, he was a staunch opponent of rebellion and separatism. As an important minister of the country, he put his life and death at risk and did his best to quell the rebellion. At the age of 76, he finally died for his country. His personality and style are admired by future generations. Liu Gongquan (778-865), courtesy name Chengxuan, was originally from Jingzhaohua. He was another great calligrapher after Yan Zhenqing in the Tang Dynasty. He is also one of the masters of regular script who has the greatest influence on later generations. His regular script, known as Liu style, has always been an important style that those who learn regular script must learn, and it is often a must-learn model for beginners to regular script.