張松
In 212, Liu Zhang invited Liu Bei into Yi Province (covering present-day Sichuan and Chongqing) to help him defend against Zhang Lu's forces in Hanzhong. Liu Bei proceeded to Jiameng Pass (in present-day Zhaohua District, Guangyuan, Sichuan) and stationed there. However, Liu Bei and Liu Zhang eventually turned hostile towards each other when Liu Zhang discovered that his follower Zhang Song had been plotting with Liu Bei to seize Yi Province from him.