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.
Qin Shi Huang
However, the "Records of the Grand Historian" also claimed that the first emperor was not the actual son of Prince Yiren but that of Lü Buwei. According to this account, when Lü Buwei introduced the dancing girl to the prince, she was Lü Buwei's concubine and had already become pregnant by him, and the baby was born after an unusually long period of pregnancy. According to translations of the Annals of Lü Buwei, Zhao Ji gave birth to the future emperor in the city of Handan in 259 BC, the first month of the 48th year of King Zhaoxiang of Qin.