Who does Cheng Tieweng Liu of Qing Dynasty refer to?

"Cheng Tieweng Liu" in Qing Dynasty refers to: Prince Cheng (eleven sons of Qianlong, the younger brother of Emperor Jiaqing), Tie Bao, Weng Fanggang and Liu Yong, who are also called the four great calligraphers in Qing Dynasty; Brief introduction of the four great calligraphers: Aisingiorro Yong, full, short and long, alias owner of Jinzhai, the eleventh son of the Qing emperor, born to Jin Jiashi, the imperial concubine of Shu family. In the fifty-fourth year of Qianlong, he became a prince. I loved calligraphy art since I was a child, and with the unique conditions, I was able to get a glimpse of what was hidden in the inner government. My book collection was also very rich, and the title was heavy for a while. Yong Xun studied regular script from Zhao Mengfu and Ou Yangxun, and small script went in and out of Jin and Tang Dynasties. His calligraphy is elegant, elegant and elegant. Cursive script is also profound and elegant. He dabbled extensively in various schools of thought, and was called the four great calligraphers in the middle of Qing Dynasty together with Liu Yong, Weng Fanggang and Tie Bao.