What are the four "bachelor's purple ministers, red apricots, and corps commander Lv Qi, a surname Huang Ting"?

"Bachelor Violet" is a great poet in Tang Dynasty, whose real name is Violet, and a bachelor of imperial academy.

Shangshu Red Apricot is a famous Song Qi in Song Dynasty, who is famous for writing "Red Apricot branches are full of spring".

Luqi, a corps commander, was Cai Yong, an official admirer of Zhong Shulang in Han Dynasty. He is a performer, and he is good at playing drums, being green and playing the name of guqin.

"Taishi Huang Ting" is a calligrapher of the Jin Dynasty, Wang Xizhi, who is familiar with internal history and once wrote Exterior Huang Ting.