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.