What nationality was Yan Zhenqing, a calligrapher in Tang Dynasty?

Does the subject want to ask, "What is the representative work of Yan Zhenqing, a calligrapher in the Tang Dynasty?" ? The cursive script "Sacrifice for Nephew", "Contention for Seats" and "Sacrifice for Uncle" are collectively called "Three Drafts of Lu Gong", which are the cursive scripts of Yan Zhenqing, a calligrapher in the Tang Dynasty. Yan Zhenqing was an outstanding calligrapher and a great patriot in the middle Tang Dynasty. Han nationality, Chen Qing, was born in Jingzhao for ten thousand years, and his ancestral home was Linyi (now Linyi, Shandong). Kaiyuan Jinshi