Jia Xu in the context of "Three Dukes"

The Three Ducal Ministers (Chinese: 三公; pinyin: Sāngōng), also translated as the Three Dukes, Three Excellencies, or the Three Lords, was the collective name for the three highest officials in Ancient China and Imperial China. These posts were abolished by Cao Cao in 208 AD and replaced with the position of Grand Chancellor. When Cao Cao's son Cao Pi became King of Wei after his father's death, he reinstated the three positions. Hua Xin was made Chancellor, Jia Xu was made Grand Commandant and Wang Lang was made Grand Secretary. When Cao Pi declared himself emperor in late 220, Hua Xin was made Cao Wei's first Minister of the Masses, Jia Xu remained as Grand Commandant, and Wang Lang was made the first Minister of Works.

Zhang Xiu (died 207) was a military general and minor warlord who lived during the late Eastern Han dynasty of China. In 197, he clashed with the warlord Cao Cao, who was then the de facto head of the Han central government, at the Battle of Wancheng and subsequent skirmishes. However, in 200, he heeded the suggestion from his adviser Jia Xu and surrendered to Cao Cao, who accepted his surrender and appointed him as a general. Having fought on Cao Cao's side at the decisive Battle of Guandu against a rival warlord Yuan Shao and in the subsequent campaigns against Yuan Shao's heirs, Zhang Xiu made great contributions during his service under Cao Cao. In 207, he died en route to joining Cao Cao on a campaign against the Wuhuan tribes. The Han imperial court honoured with the posthumous title "Marquis Ding".