The Tang Dynasty is an era in which famous writers of regular script came forth in large numbers. In this book, we have introduced Ou Yangxun and Yan Zhenqing. Of course, both of them are famous calligraphers in the Tang Dynasty, and they are also famous calligraphers in the Tang Dynasty.

Liu Gongquan was also a famous calligrapher in Tang Dynasty. Compared with the first two, these three people happened to be in three different historical periods-Ou Yangxun was born in the Northern Dynasty and entered the Tang Dynasty through the Sui Dynasty. One of the "four outstanding figures in the early Tang Dynasty" in the history of calligraphy belongs to the calligrapher in the early Tang Dynasty. Yan Zhenqing lived mainly after Kaiyuan and Tianbao, and belonged to the calligrapher in the prosperous Tang Dynasty. Liu Gongquan was a calligrapher in the middle Tang Dynasty.

With regard to the calligraphy in the late Tang Dynasty, Mr. Wu mentioned in the article "About Uncle Love Loli" which introduced Du Mu's Zhang Shi that the calligraphy in the late Tang Dynasty belonged to the desert period. Ou Yangxun, Yan Zhenqing, Liu Gongquan and Zhao Mengfu in Yuan Dynasty, and the four regular script emphasized by China people today are all here. Among the four major families of regular script, the Tang Dynasty accounted for three.

Ou Yangxun, Yan Zhenqing and Liu Gongquan all epitomize the structure of regular script, which has a lot to do with the importance attached by calligraphy in Tang Dynasty to statutes.

Liu Gongquan has many existing works, the most famous of which are Mysterious Tower Monument and Shence Army Monument, all of which are regular script works. The full name of "Xuanta Monument" is "The Record of Monks in the Left Street of Tang Dynasty", which enshrines the great virtues of the three religions and the inscription and preface of Anguji for the Xuanta Monument by Master Qi Dada. This was written by Pei Xiu and copied by Liu Gongquan. Now it is in the forest of steles in Xi 'an.

The full name of "Shence Army Monument" is "Emperor Xunxing left Shence Army Ji Shengde Monument". In the third year of Tang Wuzong Huichang (AD 843), it was set up in the forbidden area of the palace, with Cui Xuan as the author and Liu Gongquan as the author. Compared with the mysterious tower monument, the Shence military monument has been collected by the imperial court, so the preservation is much better than the mysterious tower monument. The Shence Army was the imperial army of North Asia in the Tang Dynasty, which was mainly responsible for guarding the imperial court.

The imperial army of Beiya is relative to the imperial army of Nanya in the Tang Dynasty. After the Xuanwu Gate of Emperor Taizong was changed, considering the safety of Gong Wei Palace and the geographical characteristics of Chang 'an Palace, the north was high and the south was low. The emperor of the Tang Dynasty set up an imperial army in Beiya, composed of elite soldiers, which was different from the situation that the imperial army in Nanya was commanded by the prime minister and the court. Therefore, the imperial army of Beiya became an important armed force in the Tang Dynasty.

The Shence Army is a branch of the Imperial Army of Beiya. Of course, the imperial army in North Asia was mostly controlled by eunuchs in the late Tang Dynasty, which became a hidden danger of court insecurity in the Tang Dynasty.