Yan Zhenqing studied calligraphy under Zhang Xu. Zhang Xu was a famous calligrapher in Tang Dynasty. He could write all kinds of fonts, especially cursive script.
Supplement: Yan Zhenqing (August 23, 709-784), alias, was born in Wannian, Jingzhao (now an, Shaanxi), and his ancestral home was Langxie Linyi (now Linyi, Shandong). Yan Shigu V was a famous official and outstanding calligrapher in Tang Dynasty. In the 22nd year of Kaiyuan (734), Yan Zhenqing was a Jinshi, who was appointed as the censor and moved to the palace to assist the censor. Abandoned by Yang, an important minister, he was demoted to the plain satrap, and was named "Yan Plain". During the An Shi Rebellion. The rebels fought against the rebels. After Tang Suzong acceded to the throne, he worshipped the Minister of Industry and became a consultant in Hebei. To Fengxiang, he was awarded the title of minister of constitution, and later moved to imperial doctor. When Tang Daizong was an official, he went to the official department of Shangshu Province, and a prince and a surname named him Duke Lu, which was called Duke Yan Lu in history. In the first year of Xingyuan (784), he was framed by Qilu, the prime minister, and sent to Li Xilie, the leader of the rebel army, to complain. He refused the thief in awe and was finally killed. Yan Zhenqing's calligraphy is exquisite, and he is good at writing and opening letters. He created "Yan-style" regular script, and he is also called "four masters of regular script" with Zhao Mengfu, Liu Gongquan and Ou Yangxun. Together with Liu Gongquan, they are called "Yan Liu" and "Yangu". He is good at poetry, and his works are rich, including poems, collections, Wu, Lu and Linchuan collections. The Song people compiled Yan Ji.