What do you know about calligraphers Wang Xizhi and Zhang Xu? Please choose one of them for a brief introduction.

Zhang Xu, a native of Wuxian County (now Suzhou, Jiangsu Province) in the Tang Dynasty, was once the prefect and long history of Changshu County. It is famous for its cursive script, and it is said to be three wonders with Li Bai's poems and Pei Minzhi's sword dance. Poetry is also unique, famous for its seven wonders. It ranks with Li Bai and He Ren, and with He, Zhang and Bao Rong, it is called "Four Scholars of Wuzhong". Lustful wine, every time you get drunk, you yell wildly and write freely. Zhang Dian, whose calligraphy is as famous as Huai Su's, is called "Drunk Tincture" and is called "Sage of Grass" by later buddhas. His main works include Four Poems, Heart Sutra in Cursive Script, Abdominal Pain Sticker, etc.