Who was the son of the of the warlord that was posthumously honored as "Emperor Wu of Wei"?
Cao Zizheng: Cao Zizheng (died 218) 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. Cao Cao:  As one of the central figures of the Three Kingdoms period, he laid the foundations for what was to become the state of Cao Wei and was posthumously honoured as "Emperor Wu of Wei".
Cao Zizheng