The calligrapher Zhong Zhang is the ancestor, referring to the two calligraphers Zhong Yao and Zhang Zhi. Zhong Yao was in the Cao Wei period, and regular script was not very mature yet. Zhong Yao's regular script was particularly good. Zhong Yao and Wang Xizhi were collectively called "Zhong Wang". Zhang Zhi is a native of the Eastern Han Dynasty and is known as the "Grass Saint".
As for the rise of literature in the Qin and Han Dynasties, it should be said that the articles in the Qin and Han dynasties are the best. In short, the meaning may be that if you want to learn, learn from the best