King Zhaoxiang of Qin
Reigning over 55 years, he was one of the longest-serving rulers during the Eastern Zhou Dynasty. Although making numerous policy mistakes during his later years, his aggressive territorial expansions were pivotal in consolidating the state of Qin as the dominant military powerhouse in the late Warring States period. It was the strategic dominance established during his reign that paved the way to Qin's eventual successful unification of China under his great-grandson, Ying Zheng.
King Zhaoxiang of Qin
Due to this defeat, in 299 BC King Huai of Chu was forced to go to Wu Pass (武關) to negotiate terms with Qin, but along the way was abducted and taken to Xianyang instead. When he refused to cede the territory of the Wu Commandery (巫郡) and Qianzhong Commandery (黔中郡), he was detained as a hostage. King Zhaoxiang then proceeded to invade Chu the next year, capturing 16 cities and killing 50,000 Chu soldiers. King Huai of Chu did manage to escape in 297 BC, when Qin was distracted by a joint siege on Hangu Pass by Wei and Han, but he was recaptured when he was seeking asylum in Wei, after unsuccessfully doing so in the state of Zhao. He died a year later in captivity, and Qin finally returned his corpse back to Chu.