Qin dynasty
Note: King Zhaoxiang of Qin (秦昭襄王) had already been ruling Qin for 51 years when Qin annihilated the Zhou dynasty; however the other six warring states were still independent regimes. Some Chinese historiographers thus used the next year (the 52nd year of King Zhaoxiang of Qin) as the official succession from the Zhou dynasty.
King Zhaoxiang of Qin
The next Chu king, King Qingxiang, was an even less competent ruler than his father. In 280 BC, Qin forces defeated the Chu army again, forcing them to cede Shangyong and Hanbei (漢北) to Qin control. In 279 BC, Qin generals Bai Qi (白起) and Zhang Ruo (張若) launched amphibious assaults on Chu from two different fronts, capturing the cities of Deng (鄧), Yan (鄢, Chu's secondary capital at the time) and Xiling (西陵), during which Bai Qi flooded the city of Yan with a redirected river, drowning hundreds of thousands of people. This successful Qin campaign paved the way for Bai Qi's subsequent siege and capture of the Chu capital city of Ying (郢) in 278 BC, where Bai Qi burned the Chu ancestral mausoleums Yiling. The greatly weakened state of Chu was forced to relocate its capital to Chen (陳). Qin then permanently annexed the vast lands around Dongting Lake, south of the Yangtze River and north up towards Anlu (安陸), where the new Nan Commandery (南郡) was established.