Relations between Liu Bei and Sun Quan deteriorated after Zhou Yu's death, but not to the point of war. Following Zhuge Liang's Longzhong Plan, Liu Bei led his forces westward into Yi Province and seized control of the territories from the governor, Liu Zhang. By then, Liu Bei ruled over a vast stretch of land from Yi Province to southern Jing Province; these territories served as the foundation of the state of Shu Han later. Liu Bei declared himself King of Hanzhong after defeating Cao Cao in the Hanzhong Campaign and capturing Hanzhong Commandery.