Who were the famous calligraphers in the Tang Dynasty?

In the early Tang Dynasty, there were Europe, Henan, Chu and Xue. Zhang Xu, Yan Zhenqing and Huai Su were in the prosperous Tang Dynasty. There were Liu Gongquan and Shen Chuanshi in the middle and late Tang Dynasty. Liu Gongquan took the banner of regular script from Yan Zhenqing and created his own "Liu Style", reaching another peak. Later generations called it "Yan Liu", which became a model of calligraphy in past dynasties.