Introduce Yan Gaoqing and Yan Zhenqing.

Yan Zhenqing (709-785) was born in Jingzhao (now Xi 'an). In the "An Shi Rebellion", he was highly valued by the court for resolutely resisting thieves in Pingyuan County. He served as the official minister and the criminal minister, and was named the head of "strictness". During the Dezong period, Li Xilie rebelled, and Yan Zhenqing put the country first, went to the enemy camp, stopped the thief when he knew what was right, and was finally slapped to death. Yan Zhenqing, the calligrapher with the highest achievement and the greatest influence after Wang Xizhi, became an important milestone in China literati calligraphy. He sought advice from many teachers and became a Buddha, creating an aesthetic paradigm of regular script calligraphy, which is solemn, simple and magnificent. His cursive script also conveys a calm, happy, bold and free and easy master atmosphere. There are many inscriptions handed down from ancient times, such as "Sacrifice to My Nephew", "Fight for Seats" and "Ma Gubei".

Yan Gaoqing (692-756), born in Wan 'an, Chang 'an, Tang Dynasty, was the grandson of Yan Shigu in the Five Dynasties with Yan Zhenqing. Strict father was appointed as the secretariat of Haozhou. At the beginning of Anchou, Fan Yanghu Cao joined the army. He used to work for An Lushan. In the 14th year of Tianbao, during the Anshi Rebellion, Gao Qing's father and son Ji Ming kept Changshan and Ren Taishou, while Yan Zhenqing kept the plain. They designed to kill An Lushan's Ministry and capture Gao Miao and He Bailu alive. Hebei 17 counties responded. In the fifteenth year of Tianbao, An Lushan rebels besieged Changshan. The rebels captured Yan Jiming and forced Yan Gaoqing to surrender, but Yan Gaoqing refused to surrender. He also cursed the killing of An Lushan and Ji Ming. Soon the city was destroyed by Shi Siming, and Yan Gaoqing was taken to Luoyang. In the Anshi Rebellion, Yan Gaoqing denounced Ann and was executed. After Yan Zhenqing found Ji Ming's head, he wrote the article "The Manuscripts for Sacrificing Nephews".