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 Zhuangxiang of Qin
Yiren was born to Lord Anguo, the second son and heir apparent of King Zhaoxiang, and Lord Anguo's concubine Lady Xia. He was chosen to serve as a political hostage in the Kingdom of Zhao. In Handan (the capital of Zhao) he met a merchant, Lü Buwei, who saw Yiren as extraordinary and detected in him the potential to become the king of Qin in the future. Lü Buwei treated Yiren well and presented his concubine Lady Zhao to Yiren. Lady Zhao later bore Yiren a son, Ying Zheng.