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.
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.