Is “Establishment of the nine-rank system and entrusted regency” true?
attested in history
Records of the Three Kingdoms, Book of Wei, Biography of Chen Qun documents his creation of the nine-rank system and his appointment by Cao Pi to assist Cao Rui as regent. Romance of the Three Kingdoms fully aligns with official history regarding his political status and regency role.
Chen Qun
In official history, Chen Qun established the nine-rank system and served as regent for three reigns; the novel retains his identity as a prominent Wei minister and entrusted regent.