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.
King Zhuangxiang of Qin
In the meantime, through rewards and machinations, Lü Buwei helped Yiren return to Qin. He also successfully conditioned Lord Anguo's primary spouse, the childless Lady Huayang, to adopt Yiren as her own son, thereby making Yiren become Lord Anguo's legitimate heir apparent. As Lady Huayang was a native of the Chu state, she renamed Yiren to "Zichu" (lit. "son of Chu"). Upon the death of King Zhaoxiang in 251 BC, Lord Anguo ascended the throne and became historically known as "King Xiaowen", but he died in the following year just three days after his coronation. Zichu succeeded his father as the king of Qin and became historically known as "King Zhuangxiang of Qin". He named Lü Buwei as his chancellor, Lady Zhao as his queen consort, and Ying Zheng as his crown prince.