
Cai Yong (? Nanjun, Jing Province-201) was an officer of Wei. He took a dislike to Guan Yu when the latter was with Cao Cao and tried three times to get Cao Cao to approve a campaign against him, all of which were refused. Later, while hunting remnants of the Yellow Turbans, he ran across Guan Yu, attacked him and was killed. Historically, he fought against Liu Bei while the latter was with Yuan Shao, and was killed.