1 2 Cao Rui's biography in the Sanguozhi recorded that Cao Zhen died in the 3rd month of the 5th year of the Taihe era of Cao Rui's reign.[1] This month corresponds to 20 April to 18 May 231 in the Gregorian calendar.
1 2 3 Pei Songzhi, who annotated Cao Zhen's biography in the Sanguozhi, noted that Cao Zhen's marquis title "Marquis of Shaoling" (邵陵侯) violated naming taboo because it contained the character shao (邵), which was the given name of Cao Zhen's biological father Cao Shao (曹邵) in the Sanguozhi and Wei Shu accounts.[21] The Weilue account of Cao Zhen's origins thus seems more likely to be the correct one as compared to the Sanguozhi and Wei Shu account.
