Cao Ziji (birth and death dates unknown) was a son of Cao Cao, a warlord who rose to power in the late Eastern Han dynasty and laid the foundation for the state of Cao Wei in the Three Kingdoms period of China. His mother was Lady Liu (劉姬), a concubine of Cao Cao.(武皇帝二十五男： ... 劉姬生廣宗殤公子棘， ...) Sanguozhi vol. 20. Cao Ziji died early and had no son to succeed him. He was posthumously honoured as "Duke Shang of Guangzong" (廣宗殤公) in 231 by Cao Rui, the second emperor of the Cao Wei state.(廣宗殤公子棘，早薨。太和五年追封謚。無後。) Sanguozhi vol. 20.
See also Cao Wei family trees#Cao Cao's other wives and children Lists of people of the Three Kingdoms
References
Chen, Shou (3rd century). Records of the Three Kingdoms (Sanguozhi).