Who is the calligrapher who is famous for cursive script and is called "Cao Sheng"?

Zhang Xu, Zhang Xu (675- 750) was born in Wuxian County (now Suzhou, Jiangsu Province) in the Tang Dynasty, and his ancestral home was Hehe. During Kaiyuan and Tianbao years, he served as the prefect of Changshu County, and Jin Wu has a long history. Known as cursive script, it dances with Li Bai's poems and Pei Jian, which is called "Three Musts" [1]. Poetry is also unique, famous for its seven wonders, tied with Li Bai and He Wei. Together with He, Zhang and Bao Rong, they are called "four sons of Wuzhong". Calligraphy is as famous as Huai Su. Good sex wine, according to "Old Tang Book", every time you get drunk, you scream and go crazy, and writing is called Zhang Dian. It also shows that he is crazy about art and was called "the sage of grass" by later Buddhas.