query: What dynasty was King Zhaoxiang of Qin?
passage: 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.
passage: The Qin Empire III
The series is set in the late fourth century BC to the mid-third century BC during the Warring States period of China. In 305 BC, a young Ying Ji (King Zhaoxiang) becomes the ruler of the Qin state in western China after the sudden death of his brother, Ying Dang (King Wu). As he is still underage then, his mother Queen Dowager Xuan and maternal uncle Wei Ran rule on his behalf as regents until he comes to of age.