There were Cai Jing, Su Shi, Mi Fei and Huang Tingjian in early Song Sijia.
Later, because Cai Jing was listed as a corrupt official and replaced by Cai, Su Shi became the boss, Mi Fei was the second, Huang Tingjian was the third, and Cai Xiang's calligraphy was only the last.
Personally, I like Dongpo because of my sin, hehe.