Zhang Song (onyomi: Chō Shō) was a servant of Liu Zhang. Although he was not an attractive man, he had a very brilliant mind. He despised Liu Zhang and attempted to hand Yi Province over to Cao Cao, but met Liu Bei and became fascinated with him. He handed him a map of Shu and told him that he should try to conquer Yi Province. Fa Zheng and Zhang Song's betrayal was discovered and, while Fa Zheng left to join Liu Bei, Zhang Song was executed.