Cheng Yi

Cheng Yi (rōmaji: Sei Gi) is one of the many officers who resist Cao Cao and is killed during the battle for Tong Gate.

Historical Information
Cheng Yi was briefly mentioned in various Wei records and Ma Chao's scroll from the Record of the Three Kingdoms. He was an honored man who received high praises. Together with Li Kan and Yang Qiu, he was the most influential of the Guanzhong lords. During the Battle of Tong Gate, he amassed a large army under Ma Chao and Han Sui. However, when the generals were put at odds with one another, their rebellion was crippled and scattered. Left with no other options and surrounded on both sides, Cheng Yi fought bravely through the confusion. As with Li Kan, he died in battle.

Cao Cao reportedly praised him by uttering, "While Ma Chao and Cheng Yi have conspired against me near the Yellow River of Tong Pass, it is your exploits that have truly destroyed Weinan."

Romance of the Three Kingdoms
In the novel, he is one of Han Sui's Eight Riders mentioned in chapter 58. Together with Ma Chao, he takes Chang An but is surrounded by the enemy and killed by Xiahou Yuan.