Cai Yu (? ~ 1541), a native of Wuxian (now Jiangsu), Suzhou Prefecture, South Zhili, was a writer, calligrapher and calligraphy theorist in the Ming Dynasty, and was one of the "Ten Talents in Wumen". The word Jiukui, who lives in Xishan Dongting, Wuxian County, Jiangsu Province, is a native of Linwushan, also known as Zuo Xuzi and Xia Xiaju. After having obtained the rural examination for 14 times, he came last. Guo Zisheng gave Nanjing Hanlin Confucius a good command of ancient Chinese, learned from the pre-Qin Dynasty and the Han Dynasty, and thought highly of himself. He wrote about Dongting and wanted to compete with Liu Zongyuan. Good at calligraphy, good at writing, good at writing, strong with a bald pen, and full of bones.